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Joint Inversion for Earthquake Depths Using Local Waveforms and Amplitude Spectra of Rayleigh Waves

Jia, Zhe and Ni, Sidao and Chu, Risheng and Zhan, Zhongwen (2017) Joint Inversion for Earthquake Depths Using Local Waveforms and Amplitude Spectra of Rayleigh Waves. Pure and Applied Geophysics, 174 (1). pp. 261-277. ISSN 0033-4553 . http://resolver.caltech.edu/CaltechAUTHORS:20161109-072100734

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Abstract

Reliable earthquake depth is fundamental to many seismological problems. In this paper, we present a method to jointly invert for centroid depths with local (distance < 5°) seismic waveforms and regional (distance of 5°–15°) Rayleigh wave amplitude spectra on sparse networks. We use earthquake focal mechanisms and magnitudes retrieved with the Cut-and-Paste (CAP) method to compute synthetic amplitude spectra of fundamental mode Rayleigh wave for a range of depths. Then we grid search to find the optimal depth that minimizes the joint misfit of amplitude spectra and local waveforms. As case studies, we apply this method to the 2008 Wells, Nevada Mw6.0 earthquake and a Mw5.6 outer-rise earthquake to the east of Japan Trench in 2013. Uncertainties estimated with a bootstrap re-sampling approach show that this joint inversion approach constrains centroid depths well, which are also verified by independent teleseismic depth-phase data.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1007/s00024-016-1373-1DOIArticle
http://link.springer.com/article/10.1007%2Fs00024-016-1373-1PublisherArticle
http://rdcu.be/tsZjPublisherFree ReadCube access
Additional Information:© 2016 Springer International Publishing. Received: 19 November 2015; Revised: 31 July 2016; Accepted: 04 August 2016; First Online: 17 August 2016. We thank Robert Herrmann and Charles Ammon for sharing their CPS (Computer Programs in Seismology) package; and Lupei Zhu for sharing his FK and CAP codes. We thank the reviewers and editor for their positive and constructive comments and suggestions. All figures are plotted with help of Generic Mapping Tools (GMT) code (Wessel and Smith 1998). Data used in this study were downloaded from the IRIS data management center and National Research Institute for Earth Science and Disaster Prevention (NIED) earthquake and volcano data center. Seismic networks used in this work are listed in Table 3. The study is supported by China MOST 973 program (2014CB845901) and NSFC (No. 41461164003).
Group:Seismological Laboratory
Funders:
Funding AgencyGrant Number
Ministry of Science and Technology (China) 973 Program2014CB845901
National Natural Science Foundation of China41461164003
Subject Keywords:Centroid depth; moderate earthquakes; Rayleigh wave; earthquake source parameter
Record Number:CaltechAUTHORS:20161109-072100734
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20161109-072100734
Official Citation:Jia, Z., Ni, S., Chu, R. et al. Pure Appl. Geophys. (2017) 174: 261. doi:10.1007/s00024-016-1373-1
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:71852
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:09 Nov 2016 18:09
Last Modified:14 Jun 2017 17:42

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