Narrow Rupture of the 2020 Mw 7.4 La Crucecita, Mexico, Earthquake

2021 ◽  
Author(s):  
Rumeng Guo ◽  
Hongfeng Yang ◽  
Yifan Zhu ◽  
Yong Zheng ◽  
Jianqiao Xu ◽  
...  
Keyword(s):  
Seismic Source ◽  
Source Model ◽  
Coseismic Slip ◽  
Southern Mexico ◽  
Slow Slip Events ◽  
Leading Role ◽  
Stress Changes ◽  
Seismic Source Model ◽  
Migratory Pattern ◽  
Mexico Earthquake

Abstract On 23 June 2020, a large (Mw 7.4) interplate thrust earthquake struck near the town of La Crucecita in the state of Oaxaca in southern Mexico, following a 55-yr interseismic period. A seismic source model is well constrained by teleseismic waveforms, static Global Positioning System offsets, and tsunami data, suggesting that the earthquake occurred on the slab interface at a dip of ∼23°, with a narrow elliptical asperity concentrating around a shallow depth of ∼20  km. The rupture propagates bilaterally from the hypocenter, and the down-dip rupture is restricted to ∼25  km by slow slip events (SSEs). The down-dip shear stress is released by SSEs during the interseismic period, limiting the earthquake magnitude and possibly resulting in the characteristic earthquake. The 2020 La Crucecita event, thus, is a good reminder to assess the seismic and tsunami potential in this region. The stress changes caused by the coseismic slip of the 2017 Mw 8.2 Chiapas earthquake are too small to trigger the 2020 La Crucecita earthquake. However, combined with the postseismic afterslip effects that play a leading role, it greatly promotes the eventual occurrence of the La Crucecita event. The results demonstrate the importance of considering postseismic afterslip, when evaluating seismic hazard and its migratory pattern.

Seismic source model for moving vehicles

2005 ◽  
Vol 43 (2) ◽  
pp. 248-256 ◽  
Author(s):  
S.A. Ketcham ◽  
M.L. Moran ◽  
J. Lacombe ◽  
R.J. Greenfield ◽  
T.S. Anderson
Keyword(s):  
Seismic Source ◽  
Source Model ◽  
Moving Vehicles ◽  
Seismic Source Model

On the Nature of Logic Trees in Probabilistic Seismic Hazard Assessment

2012 ◽  
Vol 28 (3) ◽  
pp. 1291-1296 ◽  
Author(s):  
Roger Musson
Keyword(s):  
Seismic Hazard Assessment ◽  
Seismic Source ◽  
Source Model ◽  
Probabilistic Seismic Hazard Assessment ◽  
Motion Model ◽  
Logic Tree ◽  
Ground Motion Model ◽  
Seismic Source Model ◽  
Kolmogorov Axioms ◽  
Better Than

An objection sometimes made against treating the weights of logic tree branches as probabilities relates to the Kolmogorov axioms, but these are only an obstacle if one believes that logic tree branches represent a seismic source model or ground motion model as being “true.” Models are never true, but some models are better than others. It is argued here that a logic tree weight represents the probability that the model in question is better than the others considered. Only one branch can be the best one, and one branch must be the best one. It is also argued that there are situations in PSHA where uncertainty exists but the analyst lacks the means to express it. Therefore it is not necessarily the case that more information increases uncertainty; it may be that more information increases the possibility of expressing uncertainty that was previously unmanageable.

Developing a seismic source model for the Arabian Plate

2018 ◽  
Vol 11 (15) ◽  
Author(s):  
I. El-Hussain ◽  
Y. Al-Shijbi ◽  
A. Deif ◽  
A. M. E. Mohamed ◽  
M. Ezzelarab
Keyword(s):  
Seismic Source ◽  
Source Model ◽  
Arabian Plate ◽  
Seismic Source Model

scholarly journals Model for Calculating Seismic Wave Spectrum Excited by Explosive Source

2021 ◽  
Vol 2021 ◽  
pp. 1-15
Author(s):  
Qian Xu ◽  
Zhong-Qi Wang
Keyword(s):  
Seismic Wave ◽  
Seismic Waves ◽  
Wave Spectrum ◽  
Seismic Source ◽  
Source Model ◽  
Detonation Pressure ◽  
Adiabatic Expansion ◽  
Main Frequency ◽  
Explosive Source ◽  
Seismic Source Model

To reveal the characteristics and laws of the seismic wavefield amplitude-frequency excited by explosive source, the method for computing the seismic wave spectrum excited by explosive was studied in this paper. The model for calculating the seismic wave spectrum excited by explosive source was acquired by taking the seismic source model of spherical cavity as the basis. The results of using this model show that the main frequency and the bandwidth of the seismic waves caused by the explosion are influenced by the initial detonation pressure, the adiabatic expansion of the explosive, and the geotechnical parameters, which increase with the reduction of initial detonation pressure and the increase of the adiabatic expansion. The main frequency and the bandwidth of the seismic waves formed by the detonation of the explosives in the silt clay increase by 23.2% and 13.6% compared to those exploded in the silt. The research shows that the theoretical model built up in this study can describe the characteristics of the seismic wave spectrum excited by explosive in a comparatively accurate way.

Western Mexico seismic source model for the seismic hazard assessment of the Jalisco-Colima-Michoacán region

2020 ◽  
Author(s):  
Rashad Sawires ◽  
Miguel A. Santoyo ◽  
José A. Peláez ◽  
Jesús Henares
Keyword(s):  
Seismic Hazard ◽  
Hazard Assessment ◽  
Seismic Hazard Assessment ◽  
Seismic Source ◽  
Source Model ◽  
Western Mexico ◽  
Seismic Source Model

scholarly journals Integrated seismic source model of the 2015 Gorkha, Nepal, earthquake

2015 ◽  
Vol 42 (15) ◽  
pp. 6229-6235 ◽  
Author(s):  
Yuji Yagi ◽  
Ryo Okuwaki
Keyword(s):  
Seismic Source ◽  
Source Model ◽  
Nepal Earthquake ◽  
Seismic Source Model ◽  
2015 Gorkha Nepal Earthquake

Tsunami Simulation Using Vertical Displacement Calculated from Simulation of Ground Motion due to Seismic Source Model

2012 ◽  
Vol 12 ◽  
pp. 4_308-4_318
Author(s):  
Shinichi AKIYAMA ◽  
Kaoru KAWAJI ◽  
Mariko KORENAGA ◽  
Satoru FUJIHARA ◽  
Takahiro TAMIYA
Keyword(s):  
Ground Motion ◽  
Seismic Source ◽  
Vertical Displacement ◽  
Source Model ◽  
Tsunami Simulation ◽  
Seismic Source Model

Seismic hazard estimate from background seismicity in southern California

1996 ◽  
Vol 86 (5) ◽  
pp. 1372-1381 ◽  
Author(s):  
Tianqing Cao ◽  
Mark D. Petersen ◽  
Michael S. Reichle
Keyword(s):  
Seismic Hazard ◽  
Southern California ◽  
Seismic Source ◽  
Source Model ◽  
Historical Seismicity ◽  
Rational Approach ◽  
Smoothing Function ◽  
Background Seismicity ◽  
Seismic Source Model ◽  
Seismicity Catalog

Abstract We analyzed the historical seismicity in southern California to develop a rational approach for calculating the seismic hazard from background seismicity of magnitude 6.5 or smaller. The basic assumption for the approach is that future earthquakes will be clustered spatially near locations of historical mainshocks of magnitudes equal to or greater than 4. We analyzed the declustered California seismicity catalog to compute the rate of earthquakes on a grid and then smoothed these rates to account for the spatial distribution of future earthquakes. To find a suitable spatial smoothing function, we studied the distance (r) correlation for southern California earthquakes and found that they follow a 1/rµ power-law relation, where µ increases with magnitude. This result suggests that larger events are more clustered in space than smaller earthquakes. Assuming the seismicity follows the Gutenberg-Richter distribution, we calculated peak ground accelerations (PGA) for 10% probability of exceedance in 50 yr. PGA estimates range between 0.25 and 0.35 g across much of southern California. These ground-motion levels are generally less than half the levels of hazard that are obtained using the entire seismic source model that also includes geologic and geodetic data. We also calculated the overall uncertainty for the hazard map using a Monte Carlo method and found that the coefficient of variation is about 0.24 ± 0.01 for much of the region.

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