scholarly journals Temporal Changes in Stress Drop, Frictional Strength, and Earthquake Size Distribution in the 2011 Yamagata-Fukushima, NE Japan, Earthquake Swarm, Caused by Fluid Migration

2017 ◽  
Vol 122 (12) ◽  
pp. 10,379-10,397 ◽  
Author(s):  
Keisuke Yoshida ◽  
Tatsuhiko Saito ◽  
Yumi Urata ◽  
Youichi Asano ◽  
Akira Hasegawa
Keyword(s):  
Size Distribution ◽  
Stress Drop ◽  
Earthquake Swarm ◽  
Temporal Changes ◽  
Fluid Migration ◽  
Frictional Strength ◽  
Earthquake Size ◽  
Ne Japan

scholarly journals Simultaneous Dependence of the Earthquake‐Size Distribution on Faulting Style and Depth

2019 ◽  
Vol 46 (20) ◽  
pp. 11044-11053 ◽  
Author(s):  
A. Petruccelli ◽  
P. Gasperini ◽  
T. Tormann ◽  
D. Schorlemmer ◽  
A.P. Rinaldi ◽  
...  
Keyword(s):  
Size Distribution ◽  
Earthquake Size

Hierarchy in earthquake size distribution

1985 ◽  
Vol 37 (2-3) ◽  
pp. 149-168 ◽  
Author(s):  
Yoshio Fukao ◽  
Muneyoshi Furumoto
Keyword(s):  
Size Distribution ◽  
Earthquake Size

Lessons from a Small Local Earthquake (Mw 3.2) That Produced the Highest Acceleration Ever Recorded in Mexico City

2020 ◽  
Vol 91 (6) ◽  
pp. 3391-3406
Author(s):  
Shri Krishna Singh ◽  
Luis Quintanar-Robles ◽  
Danny Arroyo ◽  
Victor Manuel Cruz-Atienza ◽  
Victor Hugo Espíndola ◽  
...  
Keyword(s):  
Seismic Hazard ◽  
Mexico City ◽  
Stress Drop ◽  
Seismic Waves ◽  
Earthquake Swarm ◽  
Site Amplification ◽  
Function Technique ◽  
Ground Acceleration ◽  
Crustal Earthquakes ◽  
Variable Site

Abstract A reliable estimation of seismic hazard-facing Mexico City from local earthquakes has suffered from poor seismic instrumentation, complex crustal structure, large and variable site amplification, and lack of knowledge of recurrence period of earthquakes on the mapped faults. Owing to recent improvement in local seismic networks, an earthquake swarm activity, which occurred in June–August 2019, was well recorded. The largest event of the sequence, an Mw 3.2 earthquake, caused panic in the city and produced peak ground acceleration (PGA) exceeding 0.3g at the closest station (MHVM) about 1 km away. An analysis of the event shows that it had normal-faulting focal mechanism, consistent with northeast–southwest-oriented mapped faults in the region. It was located at a depth of ∼1  km and had a low stress drop (∼0.1  MPa). We find that the high PGA for this low stress-drop event resulted from high-frequency amplification at MHVM (about factor of ∼6 around 13 Hz), likely due to topographic site effects, superimposed on a pervasive broadband amplification of seismic waves at hill-zone sites in the Valley of Mexico (up to ∼10 in the frequency band of 0.2–10 Hz). Simulation of ground motion for a scenario Mw 5.0 earthquake, using an empirical Green’s function technique, reveals that such an event may give rise to significant seismic intensities in the lake-bed zone of Mexico City. The results emphasize the need to re-evaluate the seismic hazard to Mexico City from local crustal earthquakes in the Valley of Mexico.

Variations in earthquake-size distribution across different stress regimes

Nature ◽  
2005 ◽  
Vol 437 (7058) ◽  
pp. 539-542 ◽  
Author(s):  
Danijel Schorlemmer ◽  
Stefan Wiemer ◽  
Max Wyss
Keyword(s):  
Size Distribution ◽  
Earthquake Size
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