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

Lin, YY; Ma, KF; Kanamori, H; Song, TRA; Lapusda, N; Tsai, V; (2016) Evidence for non-self-similarity of microearthquakes recorded at a Taiwan borehole seismometer array. Geophysical Journal International , 206 (2) pp. 757-773. 10.1093/gji/ggw172. Green open access

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Abstract

We investigate the relationship between seismic moment M0 and source duration tw 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 M0 scales with tw, we remove path effects by using a path-averaged Q. The results indicate a nearly constant tw for events within each cluster, regardless of M0, with mean values of tw being 0.058, 0.056 and 0.034 s for Clusters A, B and C, respectively. Constant tw, independent of M0, violates the commonly used scaling relation tw∝M1/30tw∝M01/3. 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.

Type: Article
Title: Evidence for non-self-similarity of microearthquakes recorded at a Taiwan borehole seismometer array
Open access status: An open access version is available from UCL Discovery
DOI: 10.1093/gji/ggw172
Publisher version: http://dx.doi.org/10.1093/gji/ggw172
Language: English
Additional information: Copyright © The Authors 2016. Published by Oxford University Press on behalf of The Royal Astronomical Society. This is a pre-copyedited, author-produced PDF of an article accepted for publication in Geophysical Journal International following peer review. The version of record Lin, YY; Ma, KF; Kanamori, H; Song, TRA; Lapusda, N; Tsai, V; (2016) Evidence for non-self-similarity of microearthquakes recorded at a Taiwan borehole seismometer array. Geophysical Journal International , 206 (2) pp. 757-773 is available online at: http://gji.oxfordjournals.org/content/206/2/757
Keywords: Earthquake dynamics, Earthquake source observations, Seismic attenuation
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Earth Sciences
URI: https://discovery.ucl.ac.uk/id/eprint/1502426
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