where E is the energy calculated by log 10 E = 11.8 + 1.5M S where energy, E, is expressed in ergs, and M s is the surface wave magnitude. Based on the seismic energy radiated by the earthquake as estimated by integration of digital waveforms. Mh: any: any: N/A: Non-standard magnitude method. Generally used when standard methods will not work.PGA depends on the distance to the structure and to the location where the earthquake occurs. The origin of the earthquake is known as the epicenter. In addition, PGA depends on the geology of the ground, how deep the earthquake occurs, etc. PGA represents the multiples of the gravitational acceleration (g = 9.81 m/s 2). For example, Peak ... now big earthquakes are measured using the moment magnitude scale; both scales essentially rank the power (energy release) of the earthquake. 13. What data is used to determine magnitude? The magnitude determination is based on seismic data. A graphical device, called a nomogram, is used to estimate the magnitude from the earthquake’s data. A ...We can also calculate the magnitude of a vector as the square root of the dot product of the vector with itself: |V| = √ (V·V) By definition, the magnitude of a unit vector is 1. Our unit vector calculator helps you learn how to normalize any vector. Matrices can also have magnitudes, or at least, they have norms that indicate the magnitude ...For instance if you know the distance between earthquake's location and the location of the seismic station. You can calculate P and S wave arrivals as below: d = t (S-P)*8 d = t (S-P)*10 First formula is used by local earthquakes (epicentral distance: 0-500 km) and the second one is used for regional earthquakes (epicentral distance: up to ...The magnitude of the resultant vector can be found by using the law of cosines. The formula is: r = √ (A^2 + B^2 - 2ABcosθ), where A and B are the magnitudes of the original vectors,and θ is the angle between the vectors. Is the magnitude of a vector a scalar?Nov 23, 2015 · Micro • Magnitude less than-3.0 Minor • Magnitude in the rage of 3.0 to 3.9 Light • Magnitude in the rage of 4.0 to 4.9 Moderate • Magnitude in the rage of 5.0 to 5.9 Strong • Magnitude in the rage of 6.0 to 6.9 Major • Magnitude in the rage of 7.0 to 7.9 Great •Magnitude is greater than or equal to 8.0 22-Sept-2017 ... Basically, magnitude is a number representing the total energy released in an earthquake, said seismologist Lucy Jones. The energy released is ...The Richter scale is a logarithmic function that is used to measure the magnitude of earthquakes. The magnitude of an earthquake is related to how much energy is released by the quake. Instruments called seismographs detect movement in the earth; the smallest movement that can be detected shows on a seismograph as a wave with amplitude [latex]A ...30-Jul-2023 ... The magnitude of an earthquake is measured by determining the height of the biggest seismic wave shown on a scale by a seismograph. With the ...Earthquake today: Back-to-back two earthquakes struck India's neighbouring country Nepal on Sunday. After morning's episode, the country was struck by another …22-Sept-2017 ... Basically, magnitude is a number representing the total energy released in an earthquake, said seismologist Lucy Jones. The energy released is ...Calculating an accurate preliminary magnitude is difficult because the earthquake itself is a complex process. Besides, several different techniques exist to calculate the earthquake magnitude. Some techniques are easier to apply and can return an approximate magnitude value within a few seconds from the earthquake onset.Jul 22, 2020 · Today, earthquake magnitude measurement is based on the Moment Magnitude Scale (MMS). MMS measures the movement of rock along the fault. The U.S. Geological Survey has a calculator that can help you make these calculations. So, for instance, a magnitude 8.2 — probably the strongest earthquake that could hit Southern California on ...Using x for the x -coordinate, y for the y -coordinate and F for the magnitude of the force, this can be expressed as: F=\sqrt {x^2+y^2} F = x2 +y2. In words, the resultant force is the square root of x 2 plus y 2. Using the example above:For real pro-earthquake rapid-loss estimation --- magnitude being given [by a network operator] and identified the source/fault --- the published correlations should be helpful.6.1 - 6.9. Can cause damage to poorly constructed buildings and other structures in areas up to about 100 kilometers across where people live. 7.0 - 7.9. "Major" earthquake. Can cause serious damage over larger areas. 8.0 - 8.9. "Great" earthquake. Can cause serious damage and loss of life in areas several hundred kilometers across. The magnitude of the resultant vector can be found by using the law of cosines. The formula is: r = √ (A^2 + B^2 - 2ABcosθ), where A and B are the magnitudes of the original vectors,and θ is the angle between the vectors. Is the magnitude of a vector a scalar?The surface wave magnitude ( ) scale is one of the magnitude scales used in seismology to describe the size of an earthquake. It is based on measurements of Rayleigh surface waves that travel along the uppermost layers of the Earth. This magnitude scale is related to the local magnitude scale proposed by Charles Francis Richter in 1935, with ... Magnitude calculations are based on a logarithmic scale, so a ten-fold drop in amplitude decreases the magnitude by 1.If an amplitude of 20 millimetres as measured on a seismic signal corresponds to a magnitude 2 earthquake, then:10 times less (2 millimetres) corresponds to a magnitude of 1;100 times less (0.2 millimetres) corresponds to ... Alternatively, a b-value significantly different from 1.0 may suggest a problem with the data set; e.g. it is incomplete or contains errors in calculating magnitude. Roll-off compared to ideal GR law with b=1 Magnitude of the August 2016 Central Italy earthquake (red dot) and aftershocks (which continued to occur after the period shown here)We can also calculate the magnitude of a vector as the square root of the dot product of the vector with itself: |V| = √ (V·V) By definition, the magnitude of a unit vector is 1. Our unit vector calculator helps you learn how to normalize any vector. Matrices can also have magnitudes, or at least, they have norms that indicate the magnitude ...Jun 5, 2018 · Thus, a magnitude 7.0 earthquake releases about 32 times as much energy as one of 6.0 and nearly 1,000 times that of 5.0.” [i] While magnitude can be a predictor of seismic loss, scientists have found that damage to buildings and infrastructure during earthquakes relates more to ground motion than to magnitude itself, and there is no certain ... Feb 16, 2018 · I used an ADXL345 Accelerometer to detect if there is an earthquake. I used the Adafruit ADXL345 example to determine a acceleration of x-axis, y-axis and z-axis in terms of m/s^2. I want to used the Japan Meteorological Agency seismic intensity scale to determine the intensity level of the earthquake because it gives the Peak Ground Acceleration. Richter scale magnitude calculator. Natural Language. Math Input. Extended Keyboard. Examples. Wolfram|Alpha brings expert-level knowledge and capabilities to the broadest possible range of people—spanning all professions and education levels.Mar 24, 2014 · Since the SRC started monitoring earthquakes in 1976, we have used a standard Richter-method formula to calculate earthquake magnitudes, using a function to replicate the look-up table traditionally used to compensate for the distance of the earthquake from the seismograph. We have referred to this type of magnitude as ML (magnitude, local) but ... The table 2 shows that the mean magnitude of the earthquakes was 6.65 Ms with standard . deviation of 0.69. According to the Ri chter magnitude sc ale used by the PHIVOLC S, seismic .Since the SRC started monitoring earthquakes in 1976, we have used a standard Richter-method formula to calculate earthquake magnitudes, using a function to replicate the look-up table traditionally used to compensate for the distance of the earthquake from the seismograph. We have referred to this type of magnitude as ML (magnitude, local) but ...This study collected acceleration records and station reports from 379 strong-motion stations triggered by the Mw7.7 earthquake in Pazarcik, Türkiye, on 6 February 2023. A total of 451 horizontal and 194 vertical strong-motion acceleration records with complete waveforms and reasonable data were selected to establish appropriate equations for predicting seismic parameters. Two iterative ...Calculator How much bigger is a magnitude 8.7 earthquake than a magnitude 5.8 earthquake? An explanation of the magnitude of an earthquake versus the strength, or energy release, of an earthquake... with a little bit of math. How much bigger is a magnitude... larger magnitude (range is -3.0 to 10.0) than a magnitude... The Gutenberg-Richter magnitude-frequency relationship for earthquakes is given by log(N(M)) = a - bM where M is magnitude, N(M) is the number of ...25-Dec-2022 ... The most commonly used magnitude scale for earthquakes is the moment magnitude scale, which is based on the seismic moment (a measure of the ...This force acts linearly along the length of the dam and at the reservoir level. The magnitude of this force varies from 250 to 1500 kN/sq.m depending upon the temperature variations. On an average, a value of 500 kN/sq.m may be taken under ordinary circumstances. Different types of forces acts on a dam structure such as water pressure, …The difference in earthquake magnitude is calculated using the Richter scale formula: Magnitude Difference = |M1 – M2|, where M1 and M2 are the magnitudes of two earthquakes. Each whole number increase on the Richter scale represents a tenfold increase in amplitude and approximately 31.6 times more energy release.15-Mar-2011 ... In mathspeak, the formula is 10^((M1-M2)*1.5). (This works because the energy scales with 3/2 of magnitude, for reasons that don't matter.).The first is a model which can determine which earthquakes should produce a signal on the seismometer given a certain magnitude and distance. For example a ...Because local magnitude is the most commonly determined magnitude type for Australian earthquakes, particularly of small-to-moderate magnitudes, these magnitude types will dominate the maximum likelihood earthquake rate calculations. Earthquakes that use M W, M S or m b as their preferred magnitude type are limited in number and …An earthquake of magnitude 7 is times strong than an earthquake of magnitude 5. An earthquake of magnitude 8 is times stronger than an earthquake of magnitude 5. Example 1: Early in the century the earthquake in San Francisco registered 8.3 on the Richter scale. In the same year, another earthquake was recorded in South America that was four ... In a new study, researchers applied the reversible-jump Markov chain Monte Carlo method to observational data of the 2011 Tōhoku-oki earthquake in Japan, whose aftermath is pictured here.Calculating Earthquake Magnitude The magnitude of an earthquake is a number that allows earthquakes to be compared with each other in terms of their relative power. For several decades, earthquake magnitudes were calculated based on a method first developed by Charles Richter, a seismologist based in California.Earthquake populations approximately follow this relationship: log N = a - bM.. This is a power-law equation in which N is the number of earthquakes whose magnitude exceeds M and a and b are constants. For the majority of earthquake catalogs, the constant b is approximately equal to 1. When b≈ 1, this equation describes a line whose slope is about -1.In a band both trumpets and tubas can play at the same volumes or magnitude, but the smaller trumpet plays higher notes. For the same magnitude, a short fault will produce more high frequencies than a longer fault. Below are two seismograms, or records of ground shaking, that you can listen to. They are from two different earthquakes that ... RI(M) = average time between earthquakes with magnitudes greater than or equal to M. This is the same as RI(M) = 1 / N C(M) (remember, N C is normalized to “the number of earthquakes per year” or earthquakes/year. So when we take the inverse, we get years/earthquake). If we know the parameters A and b for a region, we can calculate …To quantify the effects of this resolution issue, for each earthquake, we calculate the relative stretching of each STF to the resolvable delta function for the earthquake. We then repeat the analysis after applying a smaller, magnitude-dependent frequency bandwidth (2/ns to 40/ns Hz) filter to the STFs and the delta functions, to …On Friday, the Indonesian island of Sulawesi was hit by an earthquake of 7.5-magnitude, followed by a 20 foot tsunami. More than 1,200 deaths have been confirmed, and the city of Palu needs help. On Friday, the Indonesian island of Sulawesi...Moment magnitude scale. The moment magnitude scale ( MMS; denoted explicitly with Mw or Mw, and generally implied with use of a single M for magnitude [1]) is a measure of an earthquake 's magnitude ("size" or strength) based on its seismic moment. It was defined in a 1979 paper by Thomas C. Hanks and Hiroo Kanamori. Calculator How much bigger is a magnitude 8.7 earthquake than a magnitude 5.8 earthquake? An explanation of the magnitude of an earthquake versus the strength, or …The magnitude of an earthquake is partially determined by the area of the fault that moved and how much it moved (the slip amplitude). ... To calculate that response, we use a one-dimensional seismic velocity model based on the PREM (Dziewonski & Anderson, 1981) and LITH1.0 (Pasyanos et al., ...It now supersedes the Richter magnitude scale which measures the height of a seismic wave. The two scales will indicate similar results if the earthquake magnitudes are between 3.0 and 7.0. Seismologists studying larger earthquakes (greater than M3.5 - M4.0) generally report the size of the earthquake using the moment magnitude scale.Moment magnitude, a quantitative measure of an earthquake’s magnitude (or relative size), developed in the 1970s by Hiroo Kanamori and Thomas C. Hanks. Size calculations are tied to an earthquake’s seismic moment …It now supersedes the Richter magnitude scale which measures the height of a seismic wave. The two scales will indicate similar results if the earthquake magnitudes are between 3.0 and 7.0. Seismologists studying larger earthquakes (greater than M3.5 - M4.0) generally report the size of the earthquake using the moment magnitude scale.Jun 5, 2018 · Thus, a magnitude 7.0 earthquake releases about 32 times as much energy as one of 6.0 and nearly 1,000 times that of 5.0.” [i] While magnitude can be a predictor of seismic loss, scientists have found that damage to buildings and infrastructure during earthquakes relates more to ground motion than to magnitude itself, and there is no certain ... Magnitude Types; Magnitude Type Magnitude Range Distance Range Equation Comments; Mww (Moment W-phase)(generic notation Mw) ~5.0 and larger: 1 - 90 …For each step up in magnitude an earthquake releases 30 times more energy. What are the four factors that affect the intensity of an earthquake? {1} The distance away from the epicenter. {2} The depth of the earthquake. {3} The population density of the area affected by the earthquake. {4} The local geology of the area.It now supersedes the Richter magnitude scale which measures the height of a seismic wave. The two scales will indicate similar results if the earthquake magnitudes are between 3.0 and 7.0. Seismologists studying larger earthquakes (greater than M3.5 - M4.0) generally report the size of the earthquake using the moment magnitude scale. Similarly, loss estimates from a 7.8 magnitude earthquake in Southern California would cause over USD 200 billion in economic losses (USGS 2008). Public and private enterprises analyze their portfolio of assets to assess and to manage their earthquake risk. In calculating the earthquake risk of each asset, social and economic …11.3 Measuring Earthquakes. There are two main ways to measure earthquakes. The first of these is an estimate of the energy released, and the value is referred to as magnitude. This is the number that is typically used by the press when a big earthquake happens. It is often referred to as “Richter magnitude,” but that is a misnomer, and it ...Magnitude is determined using the logarithm of the amplitude (height) of the largest seismic wave calibrated to a scale by a seismograph.number of earthquakes across the Earth in each of these groups is also shown in the table; it indicates that on an average one Great Earthquake occurs each year. Table 1: Global occurrence of earthquakes Magnitude Annual Average Number Great 8 and higher 1 Major 7 – 7.9 18 Strong 6 – 6.9 120 Moderate 5 – 5.9 800Other articles where earthquake magnitude is discussed: earthquake: Earthquake magnitude: Earthquake magnitude is a measure of the “size,” or amplitude, of the seismic waves generated by an earthquake source and recorded by seismographs. (The types and nature of these waves are described in the section Seismic waves.) Because the size of …The Richter scale formula measures and records the movement of the Earth at the epicenter of an earthquake. This number is then used to calculate the energy that has been released. This formula was developed by Charles Richter, in the year 1935. It was prepared from the logarithm of amplitude of waves, that were recorded by seismographs.Earthquake Survival: Securing the Home - Earthquake survival in your home is discussed in this section. Learn about earthquake survival. Advertisement It's impossible for a building to be considered "earthquake proof." Earthquakes vary in t...A link from Reuters A link from Reuters A strong earthquake centred off the coast of northeastern Japan has shaken buildings as far away as Tokyo and led to a tsunami warning for coastal areas of the northeast. The earthquake had a prelimin...Enjoy 7 days of ad-lite experience absolutely Free! Log in now to access this offer Earthquake today: An earthquake of magnitude 4.3 on richter scale hit Nepal on SundayEarthquake Survival: Securing the Home - Earthquake survival in your home is discussed in this section. Learn about earthquake survival. Advertisement It's impossible for a building to be considered "earthquake proof." Earthquakes vary in t...An earthquake of magnitude 7 is times strong than an earthquake of magnitude 5. An earthquake of magnitude 8 is times stronger than an earthquake of magnitude 5. Example 1: Early in the century the earthquake in San Francisco registered 8.3 on the Richter scale. In the same year, another earthquake was recorded in South America that was four ...This is the total design lateral force along any principal direction. This is calculated as: V B = A h x W Where A h = horizontal seismic coefficient as calculated above in step 1. W = Total weight of the structure. 3. Now calculate the distribution of design forces on the structure.He said, “Based upon GPS displacement data and local topography data, we generated a new tsunami scale measurement from one to ten, much like the Richter Scale used for earthquakes.”. Any tsunami measuring more than a five on this scale would merit a basin-wide warning. For instance, Song classified the tsunami generated by the 2004 Sumatra ...Magnitude calculations are based on a logarithmic scale, so a ten-fold drop in amplitude decreases the magnitude by 1.If an amplitude of 20 millimetres as measured on a seismic signal corresponds to a magnitude 2 earthquake, then:10 times less (2 millimetres) corresponds to a magnitude of 1;100 times less (0.2 millimetres) corresponds to ... The magnitude of an earthquake is measured by the Richter scale, using the formula R= log(l/l0),... · Question: · Logarithm Scaling: · Answer and Explanation:.Richter scale magnitude calculator. Natural Language. Math Input. Extended Keyboard. Examples. Wolfram|Alpha brings expert-level knowledge and capabilities to the broadest possible range of people—spanning all professions and education levels.The earthquake is estimated to have been between magnitude 9.4 and 9.6, making it the highest magnitude earthquake ever recorded. It is estimated that anywhere from 1,000 to 6,000 people died from the earthquake itself and other resulting natural disasters.This video shows how to calculate basic Richter Scale values for an earthquake. Please note that this video talks about relative values - it does not provide...RI(M) = average time between earthquakes with magnitudes greater than or equal to M. This is the same as RI(M) = 1 / N C(M) (remember, N C is normalized to “the number of earthquakes per year” or earthquakes/year. So when we take the inverse, we get years/earthquake). If we know the parameters A and b for a region, we can calculate …20-Feb-2019 ... An earthquake has only one magnitude determined from measurements on seismographs. The first widely-used measurement was the Richter scale. It ...The histogram can be inverted assuming any magnitude earthquake is as likely as another, yielding probability density functions of magnitude and rupture length for any given displacement measurement. To improve these distributions we include a term to account for the probability that the earthquake would cause ground rupture and two …In a band both trumpets and tubas can play at the same volumes or magnitude, but the smaller trumpet plays higher notes. For the same magnitude, a short fault will produce more high frequencies than a longer fault. Below are two seismograms, or records of ground shaking, that you can listen to. They are from two different earthquakes that ... In an earthquake, damage to buildings and infrastructure is related more closely to ground motion, of which PGA is a measure, rather than the magnitude of the earthquake itself. For moderate earthquakes, PGA is a reasonably good determinant of damage; in severe earthquakes, damage is more often correlated with peak ground velocity.Aug 6, 2019 · Earthquake ground motion waves travel rapidly in the earth’s crust and mantle. That part of the earth’s solid crust closest to the surface is called bed rock. The size of the ground motion experienced at the earth’s surface is affected by the geology of the material between bed rock and the surface. Oct 11, 2013 · He said, “Based upon GPS displacement data and local topography data, we generated a new tsunami scale measurement from one to ten, much like the Richter Scale used for earthquakes.”. Any tsunami measuring more than a five on this scale would merit a basin-wide warning. For instance, Song classified the tsunami generated by the 2004 Sumatra ... The epicentre of the quake was at Dhading, about 55 km west of Kathmandu An earthquake of magnitude 6.1 struck the Nepal on Sunday, the National Seismological Centre of Nepal said. The epicentre ...This video shows how to calculate basic Richter Scale values for an earthquake. Please note that this video talks about relative values - it does not provide...The Richter magnitude of an earthquake is determined from the logarithm of the amplitude of waves recorded by seismographs (adjustments are included to compensate for the variation in the distance between the various seismographs and the epicenter of the earthquake). The original formula is: [6] The magnitude is a number that characterizes the relative size of an earthquake. Magnitude is based on measurement of the maximum motion recorded by a seismograph. A seismograph, or seismometer, is an instrument used to detect and record earthquakes. Generally, it consists of a mass attached to a fixed base.A New Method for Determining Quake Odds. Scientists can best determine earthquake probabilities for a fault once they know when it last ruptured, the sizes of possible quakes, and the rates of plate motions. For example, if plate motions are loading a fault at 1 inch per year, the fault will accumulate 100 inches of strain in 100 years.It now supersedes the Richter magnitude scale which measures the height of a seismic wave. The two scales will indicate similar results if the earthquake magnitudes are between 3.0 and 7.0. Seismologists studying larger earthquakes (greater than M3.5 - M4.0) generally report the size of the earthquake using the moment magnitude scale.The magnitude scale is logarithmic. That just means that if you add 1 to an earthquake's magnitude, you multiply the shaking by 10. An earthquake of magnitude 5 shakes 10 times as violently as an earthquake of magnitude 4; a magnitude-6 quake shakes 10 times as hard as a magnitude-5 quake; and so on.How is the magnitude of an earthquake determined? Earthquakes are recorded by a seismographic network. Each seismic station in the network measures the movement of …
Earthquake Survival: Securing the Home - Earthquake survival in your home is discussed in this section. Learn about earthquake survival. Advertisement It's impossible for a building to be considered "earthquake proof." Earthquakes vary in t.... River city engineering
earthquake though). Millions of people witnessed the motion of the earthquake on television. Sixty-seven people lost their lives, and property damage was estimated at $6 billion. Activity: Locating an Earthquake Epicenter Lecture 3 Damage from the earthquake was widespread, but the actual location of the earthquake (the epicenter)Scientists estimate that over 10,000 earthquakes occur in California each year. Most of these go unnoticed since they are minor. For example, only several hundred have a magnitude greater than 3.0 and of these,only 15 to 30 have a magnitude...01-Jan-2022 ... Modified Mercalli Intensity Scale ... The Modified Mercalli intensity scale (MM or MMI), descended from Giuseppe Mercalli's Mercalli intensity ...Keypoints: · Amplitude of seismogram · Frequency of seismic wave · Time between P, S, and surface wave arrivals · Equation used to determine the magnitude ...Los Angeles area:Within the next 30 years the probability is:60% that an earthquake measuring magnitude 6.746% that an earthquake measuring magnitude 731% that an earthquake measuring magnitude 7.5will occur in the Los Angeles region.San Francisco Bay area:Within the next 30 years the probability is:72% that an earthquake measuring magnitude 6. ... The moment magnitude (M W), which is measured using seismic arrays and generates values comparable to the Richter Scale, is more accurate for measuring earthquakes across the Earth, including large earthquakes, although they require more time to calculate. News media often report Richter magnitudes right after an earthquake occurs even though ...To calculate the moment magnitude, seismologists need to know the seismic moment, M_0 M 0: M_w = \frac {2} {3}\log (M_0) - 10.7 M w = 32 log(M 0) − 10.7. …divide the energy released in the earthquake by 10, and you’ll calculate the size weight that must be dropped from 1 meter to produce the same amount of energy. *Note: The Moment Magnitude Scale – see class notes – replaces the Richter Magnitude Scale for final magnitude determination of an Earthquake, because it provides better results ...Jun 5, 2018 · Thus, a magnitude 7.0 earthquake releases about 32 times as much energy as one of 6.0 and nearly 1,000 times that of 5.0.” [i] While magnitude can be a predictor of seismic loss, scientists have found that damage to buildings and infrastructure during earthquakes relates more to ground motion than to magnitude itself, and there is no certain ... Earthquake intensity is most often measured using the modified Mercalli scale, which was invented by the Italian geologist Giuseppi Mercalli in 1902 and uses ...The earthquake is estimated to have been between magnitude 9.4 and 9.6, making it the highest magnitude earthquake ever recorded. It is estimated that anywhere from 1,000 to 6,000 people died from the earthquake itself and other resulting natural disasters.The maximum motion of the earthquake measured by these seismometers is then used in calculating the earthquake's magnitude, which signifies the amount of energy released by the quake.The surface wave magnitude ( ) scale is one of the magnitude scales used in seismology to describe the size of an earthquake. It is based on measurements of Rayleigh surface waves that travel along the uppermost layers of the Earth. This magnitude scale is related to the local magnitude scale proposed by Charles Francis Richter in 1935, with ...Other articles where earthquake magnitude is discussed: earthquake: Earthquake magnitude: Earthquake magnitude is a measure of the “size,” or amplitude, of the seismic waves generated by an earthquake source and recorded by seismographs. (The types and nature of these waves are described in the section Seismic waves.) Because the size of …6.1 - 6.9. Can cause damage to poorly constructed buildings and other structures in areas up to about 100 kilometers across where people live. 7.0 - 7.9. "Major" earthquake. Can cause serious damage over larger areas. 8.0 - 8.9. "Great" earthquake. Can cause serious damage and loss of life in areas several hundred kilometers across. .
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