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Low stress drop earthquakes in the rupture zone of the 1992 Nicaragua tsunami earthquake

Journal Article · · Geophysical Research Letters
DOI:https://doi.org/10.1002/2016GL070409· OSTI ID:1514942
 [1];  [1];  [2]
  1. New Mexico Inst. of Mining and Technology, Socorro, NM (United States). Earth and Environmental Science Dept.
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
+ Show Author Affiliations
Tsunami earthquakes, events that generate larger than expected tsunami and are deficient in high-frequency seismic radiation, are rare but hazardous to coastal populations. One model for these events is shallow rupture through low-strength materials. We calculate here seismic moment, corner frequency, and stress drop for 216 earthquakes (2.1 < Mw < 4.7, November 2005 to June 2006) within and external to the 1992 Nicaragua tsunami earthquake rupture zone to test the hypothesis that differences in fault zone properties defined the limits of the 1992 tsunami rupture zone and continue to produce spatial variations in earthquake source properties. Mean stress drop of events within the rupture area is 1.2 MPa, and 5.5 MPa for events just outside of the rupture zone, with similar magnitude earthquakes in each group. Our results demonstrate different source parameter characteristics for microseismicity in the region of a past tsunami earthquake.
Research Organization:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); New Mexico Inst. of Mining and Technology, Socorro, NM (United States)
Sponsoring Organization:
National Science Foundation (NSF) (United States); USDOE
Grant/Contract Number:
89233218CNA000001
OSTI ID:
1514942
Report Number(s):
LA-UR--17-24634
Journal Information:
Geophysical Research Letters, Journal Name: Geophysical Research Letters Journal Issue: 19 Vol. 43; ISSN 0094-8276
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (1)

Investigating microearthquake finite source attributes with IRIS Community Wavefield Demonstration Experiment in Oklahoma journal May 2018

Figures / Tables (4)

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Related Subjects

58 GEOSCIENCES
Nicaragua
stress drop
tsunami earthquake