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A seismic intensity survey of the 1 april 2014 M 8.2 Iquique, Chile, earthquake and tsunami, and a comparison with strong-motion data

Marcella G. Cilia, Walter D. Mooney and Andrew Robinson
A seismic intensity survey of the 1 april 2014 M 8.2 Iquique, Chile, earthquake and tsunami, and a comparison with strong-motion data
Seismological Research Letters (August 2017) 88 (5): 1232-1240

Abstract

We conducted a regional seismic intensity survey in northern Chile following the 1 April 2014 M 8.2 Iquique earthquake to document the level of damage caused by the earthquake and tsunami. We observed very limited damage at the 204 sites surveyed. The modified Mercalli intensities (MMIs) reached a maximum value of VI adjacent to the earthquake rupture plane. The contours of our MMI map are similar in shape to the contour maps of peak ground acceleration (PGA) and peak ground velocity (PGV). A comparison of our seismic intensities with the recorded PGA and PGV values reveals that our MMI values are one to two units lower than predicted by ground-motion intensity conversion equations (GMICEs). We propose that this is due to the well-engineered buildings and moderate levels of high-frequency (0.5-5 Hz) ground shaking experienced during this earthquake. Whether existing GMICEs consistently overpredict seismic intensities for large subduction-zone earthquakes deserves further study.


ISSN: 0895-0695
EISSN: 1938-2057
Serial Title: Seismological Research Letters
Serial Volume: 88
Serial Issue: 5
Title: A seismic intensity survey of the 1 april 2014 M 8.2 Iquique, Chile, earthquake and tsunami, and a comparison with strong-motion data
Affiliation: U. S. Geological Survey, Earthquake Science Center, Menlo Park, CA, United States
Pages: 1232-1240
Published: 20170802
Text Language: English
Publisher: Seismological Society of America, El Cerrito, CA, United States
References: 46
Accession Number: 2017-068869
Categories: Seismology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sketch maps
S22°00'00" - S18°00'00", W72°00'00" - W68°00'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Seismological Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201736
Program Name: USGSOPNon-USGS publications with USGS authors
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