scholarly journals Estimation of the Seismic Moment Rate from an Incomplete Seismicity Catalog, in the Context of the InSight Mission to Mars

2019 ◽  
Vol 109 (3) ◽  
pp. 1125-1147 ◽  
Author(s):  
Martin Knapmeyer ◽  
Brigitte Knapmeyer‐Endrun ◽  
Ana‐Catalina Plesa ◽  
Maren Böse ◽  
Taichi Kawamura ◽  
...  
Keyword(s):  
Seismic Moment ◽  
Seismicity Catalog ◽  
Seismic Moment Rate ◽  
Insight Mission

scholarly journals Precursory accelerating seismic moment release (AMR) in a synthetic seismicity catalog: A preliminary study

2005 ◽  
Vol 32 (7) ◽  
pp. n/a-n/a ◽  
Author(s):  
Russell Robinson ◽  
Shiyong Zhou ◽  
Steven Johnston ◽  
David Vere-Jones
Keyword(s):  
Seismic Moment ◽  
Preliminary Study ◽  
Seismicity Catalog ◽  
Seismic Moment Release

scholarly journals Some preliminary results of a worldwide seismicity estimation: a case study of seismic hazard evaluation in South America

2000 ◽  
Vol 43 (1) ◽  
Author(s):  
T. M. Tsapanos ◽  
C. V. Christova
Keyword(s):  
South America ◽  
Seismic Hazard ◽  
Seismic Moment ◽  
Subduction Zones ◽  
Grid Point ◽  
Slip Rate ◽  
Hazard Evaluation ◽  
Plate Boundaries ◽  
Data Set ◽  
Seismic Moment Rate

Global data have been widely used for seismicity and seismic hazard assessment by seismologists. In the present study we evaluate worldwide seismicity in terms of maps of maximum observed magnitude (Mmax), seismic moment (M 0 ) and seismic moment rate (M 0S). The data set used consists of a complete and homogeneous global catalogue of shallow (h £ 60 km) earthquakes of magnitude MS ³ 5.5 for the time period 1894-1992. In order to construct maps of seismicity and seismic hazard the parameters a and b derived from the magnitude-frequency relationship were estimated by both: a) the least squares, and b) the maximum likelihood, methods. The values of a and b were determined considering circles centered at each grid point 1° (of a mesh 1° ´1°) and of varying radius, which starts from 30 km and moves with a step of 10 km. Only a and b values which fulfill some predefined conditions were considered in the further procedure for evaluating the seismic hazard maps. The obtained worldwide M max distribution in general delineates the contours of the plate boundaries. The highest values of M max observed are along the circum-Pacific belt and in the Himalayan area. The subduction plate boundaries are characterized by the largest amount of M 0 , while areas of continental collision are next. The highest values of seismic moment rate (per 1 year and per equal area of 10 000 km 2) are found in the Southern Himalayas. The western coasts of U.S.A., Northwestern Canada and Alaska, the Indian Ocean and the eastern rift of Africa are characterized by high values of M 0 , while most of the Pacific subduction zones have lower values of seismic moment rate. Finally we analyzed the seismic hazard in South America comparing the predicted by the NUVEL1 model convergence slip rate between Nazca and South America plates with the average slip rate due to earthquakes. This consideration allows for distinguishing between zones of high and low coupling along the studied convergence plate boundary.

scholarly journals Depth variation of seismic moment and recurrence interval in Japan

2021 ◽  
Vol 8 (1) ◽  
Author(s):  
Yingfeng Ji ◽  
Shoichi Yoshioka
Keyword(s):  
Seismic Moment ◽  
Scaling Law ◽  
Vertical Dimension ◽  
Recurrence Interval ◽  
Plate Convergence ◽  
Event Sequences ◽  
The Moment ◽  
Seismic Moment Rate ◽  
Recurrence Frequency ◽  
Regional Earthquake

AbstractIn repeating seismic event sequences within a specialized horizontal area, the moment magnitude is usually scaled with the recurrence interval. In addition to two horizontal dimensions, the vertical dimension plays a certain role in affecting the scaling law. However, whether and how the changing depth influences the scaling law remain enigmatic. Based on a large number of earthquake records with high-resolution epicenter locations in recent decades in Japan, we focus on a comparison between the 3-D seismic moment and seismic interval, which recognize the vertical dimension as the same dimension as the horizontal distances. The results show that (1) the seismic moment scaling law is applicable in the multiparameter 3-D models by visiting the 1.8 million events collected during a period of 15 years; (2) the vertical dimension of depth plays an important role in the Mo–SI relationship as well as in the variance in the 3-D seismic moment–interval magnitudes; and (3) the seismic moment rate, attributable to the plate convergence rate, varies with area and depth in influencing the regional earthquake recurrence frequency.

Maximum magnitude of subduction earthquakes along the Japan-Kuril-Kamchatka trench estimated from seismic moment conservation

2019 ◽  
Vol 219 (3) ◽  
pp. 1590-1612
Author(s):  
Fuyuki Hirose ◽  
Kenji Maeda ◽  
Yasuhiro Yoshida
Keyword(s):  
Confidence Level ◽  
Seismic Data ◽  
Seismic Moment ◽  
Tohoku Earthquake ◽  
Information Criterion ◽  
Maximum Magnitude ◽  
The 2011 Tohoku Earthquake ◽  
Interplate Seismicity ◽  
Seismic Moment Rate ◽  
Total Seismic Moment

SUMMARY We estimated the maximum magnitude of earthquakes in the Japan-Kuril-Kamchatka trench subduction zone with a method based on the conservation of seismic moment and the record of interplate seismicity from 1977 to 2017. The key point of this method is to base calculations on the tectonic moment rate instead of the total seismic moment rate. We modeled a seismic-moment-frequency distribution for the Japan-Kuril-Kamchatka trench on the basis of the truncated Gutenberg–Richter (G–R) law, the formula published by Utsu in 1974, the gamma distribution, and the tapered G–R law. We estimated the maximum magnitude along the Japan-Kuril-Kamchatka trench as ∼10 under the truncated G–R law and ∼11 under Utsu's formula, although the latter may be an overestimate. Therefore, the 2011 Tohoku earthquake, of moment magnitude 9.2, may not be the largest possible event in this area. The recurrence interval for magnitude 10 events based on the truncated G–R law is 4000 yr. Although these two models perform equally well in terms of Akaike Information Criterion, the range of the 95 per cent confidence level is consistently narrower for the truncated G–R law than for Utsu's formula. The estimated maximum magnitude depends not only on the model used, but also on the parameters that constitute the tectonic moment. It is essential to accumulate more seismic data and achieve more precise estimates of tectonic moment to improve estimates of maximum magnitude.

The slip deficit along the North Anatolian Fault (Turkey) in the Marmara Sea: Insights from paleoseismicity, seismicity and geodetic data

2020 ◽  
Author(s):  
Ersen Aksoy ◽  
Mustapha Meghraoui ◽  
Renaud Toussaint
Keyword(s):  
Seismic Moment ◽  
North Anatolian Fault ◽  
Marmara Sea ◽  
Fault Segment ◽  
Seismic Slip ◽  
The North ◽  
Future Earthquake ◽  
Spatial Grid ◽  
The Moment ◽  
Seismic Moment Rate

<p>The North Anatolian Fault experienced large earthquakes with 250 to 400 years recurrence time. In the Marmara Sea region the 1999 (Mw = 7.4) and the 1912 (Mw = 7.4) earthquake ruptures bound the Central Marmara Sea fault segment. Using historical-instrumental catalogue and paleoseismic results (≃ 2000-year database), the mapped fault segments, fault kinematic and GPS data, we compute the paleoseismic-seismic moment rate and geodetic moment rate. The geodetic moment rate is obtained by projecting the measured surface displacements to estimate the strain rate, and evaluating the associated elastic stress rate over a regular spatial grid. The paleoseismic-seismic moment rate is obtained by summing the moment tensors over regions of the spatial grid and periods of time. A clear discrepancy appears between the moment rates and implies a significant delay in the seismic slip along the fault. The rich database allows us to identify the size of the seismic gap and related fault segment and estimate the moment rate deficit. Our modeling suggest that the locked Central Marmara Sea fault segment even including a creeping section bears a moment rate deficit  = 6.4*10<sup>17</sup> N.m./yr. that corresponds to Mw ≃ 7.4 for a future earthquake with an average ≃ 3.25 m coseismic slip. Taking into account the uncertainty in the strain accumulation along the 130-km-long Central fault segment, our estimate of the seismic slip deficit being ≃ 10 mm/yr implies the size of the future earthquake ranges between Mw = 7.4 and 7.5.</p>

scholarly journals THE CONTRIBUTION OF EARTHQUAKES TO THE DEFORMATION OF ZAGROS TECTONIC PROVINCE

2019 ◽  
Vol XLII-4/W18 ◽  
pp. 993-999
Author(s):  
M. A. Sharifi ◽  
A. Bahroudi ◽  
S. Mafi
Keyword(s):  
Strain Rate ◽  
Seismic Moment ◽  
Deformation Rate ◽  
Seismic Energy ◽  
Strain Rates ◽  
Average Amount ◽  
The Moment ◽  
Seismic Moment Rate ◽  
Different Parts

Abstract. In this study, we investigate the contribution of earthquakes to the deformation of Zagros province and compare the seismicity and the density of earthquakes in different parts of the province. The mathematics used in this research is based on calculations of moment rates. The seismic moment rate is the average amount of seismic energy releases from the tectonic province in each year. The geodetic moment rate is the average amount of energy which is consumed every year to make deformation in Zagros. The ratio of these two moment rates expresses the contribution of earthquakes in making deformation in Zagros province. According to the calculations, this ratio is estimated to be 13.06%. Along with the information obtained from the moment rates, we can also obtain the shear and the dilative strain rates from the strain rate tensors, which show the volumetric changes and the deformation rate in different parts of the Zagros, respectively. The data used in this study include the focal coordinates of the Zagros earthquakes with their magnitude and the velocity vectors of the Zagros geodynamic network, which are used to calculate the seismic and the geodetic moment rates.

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