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Evidence for non-self-similarity of microearthquakes recorded at a Taiwan borehole seismometer array

Lin, Yen-Yu and Ma, Kuo-Fong and Kanamori, Hiroo and Song, Teh-Ru Alex and Lapusta, Nadia and Tsai, Victor C. (2016) Evidence for non-self-similarity of microearthquakes recorded at a Taiwan borehole seismometer array. Geophysical Journal International, 206 (2). pp. 757-773. ISSN 0956-540X. http://resolver.caltech.edu/CaltechAUTHORS:20160818-075652559

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Abstract

We investigate the relationship between seismic moment M_0 and source duration t_w of microearthquakes by using high-quality seismic data recorded with a vertical borehole array installed in central Taiwan. We apply a waveform cross-correlation method to the three-component records and identify several event clusters with high waveform similarity, with event magnitudes ranging from 0.3 to 2.0. Three clusters—Clusters A, B and C—contain 11, 8 and 6 events with similar waveforms, respectively. To determine how M_0 scales with t_w, we remove path effects by using a path-averaged Q. The results indicate a nearly constant t_w for events within each cluster, regardless of M_0, with mean values of t_w being 0.058, 0.056 and 0.034 s for Clusters A, B and C, respectively. Constant t_w, independent of M_0, violates the commonly used scaling relation t_w ∝ M^(1/3)_0. This constant duration may arise either because all events in a cluster are hosted on the same isolated seismogenic patch, or because the events are driven by external factors of constant duration, such as fluid injections into the fault zone. It may also be related to the earthquake nucleation size.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1093/gji/ggw172DOIArticle
http://gji.oxfordjournals.org/content/206/2/757PublisherArticle
ORCID:
AuthorORCID
Kanamori, Hiroo0000-0001-8219-9428
Lapusta, Nadia0000-0001-6558-0323
Tsai, Victor C.0000-0003-1809-6672
Additional Information:© 2016 The Authors. Published by Oxford University Press on behalf of The Royal Astronomical Society. Accepted 2016 April 25. Received 2016 April 22; in original form 2015 September 4. We thank Dr Volker Oye at NORSAR, Norway, providing the Microseismic Monitoring (MIMO) for our seismic clusters location. We appreciate the helpful comments from the Associated Editor, two referees and Prof Luis Rivera, who helped us to improve this manuscript. Support from the Graduate Students Study Abroad Program 101-2917-I-008-001- of the National Science Council (NSC) contributed to this international collaboration. This research was supported by the Taiwan Earthquake Research Center (TEC) funded through the Ministry of Science and Technology (MoST) with grant number 104-2116-M-008-011. The TEC contribution number for this paper is 00119.
Group:Seismological Laboratory
Funders:
Funding AgencyGrant Number
National Science Council (Taipei)101-2917-I-008-001
Ministry of Science and Technology (Taipei)104-2116-M-008-011
Taiwan Earthquake Research Center (TEC)UNSPECIFIED
Subject Keywords:Earthquake dynamics; Earthquake source observations; Seismic attenuation
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Taiwan Earthquake Research Center (TEC)00119
Record Number:CaltechAUTHORS:20160818-075652559
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20160818-075652559
Official Citation:Yen-Yu Lin, Kuo-Fong Ma, Hiroo Kanamori, Teh-Ru Alex Song, Nadia Lapusta, and Victor C. Tsai Evidence for non-self-similarity of microearthquakes recorded at a Taiwan borehole seismometer array Geophys. J. Int. (August, 2016) 206 (2): 757-773 first published online April 28, 2016 doi:10.1093/gji/ggw172
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:69741
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:18 Aug 2016 18:43
Last Modified:18 Aug 2016 18:43

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