Detecting low‐frequency earthquakes within non‐volcanic tremor in southern Taiwan triggered by the 2005 Mw8.6 Nias earthquake

Tang, Chi‐Chia; Peng, Zhigang; Chao, Kevin; Chen, Chau‐Huei; Lin, Ching‐Ren

doi:10.1029/2010gl043918

Cited by 33 publications

(71 citation statements)

References 31 publications

(63 reference statements)

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“…4). The best-fitting tremor location in the southern Central Range is close to triggered tremor sources from previous studies (Peng and Chao, 2008;Tang et al, 2010;Chao, Peng, Wu, et al, 2012). As shown in Figure 4b, the strongest tremor burst occurred when the Love wave started at ∼730 s and continued until 1000 s with subsequent Rayleigh waves.…”

Section: Taiwansupporting

confidence: 52%

“…Triggered tremor is mainly located in the lower crust below the seismogenic zone and above the Moho (Tang et al, 2010;Chao, Peng, Wu, et al, 2012). However, it is still unclear whether it occurs on the low-angle detachment fault or the high-angle thrust fault beneath the Central Range.…”

Section: Taiwanmentioning

confidence: 97%

“…Triggered tremor has been found in the southern Central Range of Taiwan, an arc-continent collision environment (Peng and Chao, 2008;Tang et al, 2010;Chao, Peng, Wu, et al, 2012). Triggered tremor is mainly located in the lower crust below the seismogenic zone and above the Moho (Tang et al, 2010;Chao, Peng, Wu, et al, 2012).…”

Section: Taiwanmentioning

confidence: 99%

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A Global Search for Triggered Tremor Following the 2011 Mw 9.0 Tohoku Earthquake

Chao

Peng

Gonzalez-Huizar

et al. 2013

Bulletin of the Seismological Society of America

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The 2011 M w 9.0 Tohoku, Japan, earthquake triggered deep tectonic tremor and shallow microearthquakes in numerous places worldwide. Here, we conduct a systematic survey of triggered tremor in regions where ambient or triggered tremor has been previously identified. Tremor was triggered in the following regions: south-central Alaska, the Aleutian Arc, Shikoku in southwest Japan, the North Island of New Zealand, southern Oregon, the Parkfield-Cholame section of the San Andreas fault in central California, the San Jacinto fault in southern California, Taiwan, and Vancouver Island. We find no evidence of triggered tremor in the Calaveras fault in northern California. One of the most important factors in controlling the triggering potential is the amplitude of the surface waves. Data examined in this study suggest that the threshold amplitude for triggering tremor is ∼0:1 cm=s, which is equivalent to a dynamic stress threshold of ∼10 kilopascals. The incidence angles of the teleseismic surface waves also affect the triggering potentials of Love and Rayleigh waves. The results of this study confirm that both Love and Rayleigh waves contribute to triggering tremor in many regions. In regions where both ambient and triggered tremor are known to occur, tremor triggered by the Tohoku event generally occurred at similar locations with previously identified ambient and/or triggered tremor, further supporting the notion that although the driving forces of triggered and ambient tremor differ, they share similar mechanisms. We find a positive relationship between the amplitudes of the triggering waves and those of the triggered tremor, which is consistent with the prediction of the clock-advance model.

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Section: Taiwansupporting

confidence: 52%

Section: Taiwanmentioning

confidence: 97%

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A Global Search for Triggered Tremor Following the 2011 Mw 9.0 Tohoku Earthquake

Chao

Peng

Gonzalez-Huizar

et al. 2013

Bulletin of the Seismological Society of America

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“…In the arc-continent collision environment in Taiwan, tremor is found mainly beneath the southern Central Range (Peng and Chao, 2008;Tang et al, 2010Tang et al, , 2013Chao et al, 2011Chao et al, , 2012Chao et al, , 2013Chuang et al, 2014;Idehara et al, 2014).…”

Section: Introductionmentioning

confidence: 98%

“…Peng and Chao (2008) first identified triggered tremor beneath the Central Range following the 2001 M w 7.9 Kunlun earthquake in northern Tibet. Subsequent tremor studies mainly focus on low-frequency earthquakes (Tang et al, 2010(Tang et al, , 2013 and both triggered (Chao et al, 2012 and ambient tremor (Chao et al, 2011;Chuang et al, 2014;Idehara et al, 2014) in the southern Central Range. Those studies utilized seismic data from two permanent seismic networks-the Broadband Array in Taiwan for Seismology (BATS) operated by the Institute of Earth Sciences in Academia Sinica (Kao et al, 1998) and the short-period Central Weather Bureau Seismic Network (CWBSN) and the Broadband Seismic Network is marked as the solid star.…”

Section: Introductionmentioning

confidence: 98%

Detecting Deep Tectonic Tremor in Taiwan with a Dense Array

Sun

Peng

Lin

et al. 2015

Bulletin of the Seismological Society of America

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We perform a systematic detection of deep tectonic tremor beneath the southern Central Range in Taiwan using a dense, small-aperture seismic array. Deployed in February 2011, the array has been recording tectonic tremor nearly continuously for 134 days, including tremor triggered by the 2011 M w 9.0 Tohoku-Oki earthquake. We use broadband frequency-wavenumber beamforming and moving-window grid-search methods to compute array parameters for all continuous data and identify tremor as coherent nonimpulsive seismic signals with deep incidence angles. The obtained array parameters closely match with those of relocated local earthquakes and triggered tremor bursts located by the waveform envelope correlation and clustering (WECC) method, indicating the robustness of our array technique. During the 134-day study period, we detect tremor for 44 days, with a total duration of 1481 min, three to six times as long as the detection of tremor by the WECC method. We find a relative quiescence in ambient tremor activity for about 20 days following the 2011 Tohoku-Oki earthquake, suggesting that dynamic stresses from the distant mainshock triggered most tremor close to failure, resulting in a temporary lack of tremor activity. In some cases, we observe rapid tremor migration with a speed at the order of 40-50 km=hr that is similar to the speed of fast tremor migration along dip on narrow streaks in Japan and Cascadia. Our results suggest that dense array techniques are capable of capturing detailed spatiotemporal evolutions of tremor behaviors in southern Taiwan.

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Ambient tremors in a collisional orogenic belt

Chuang

Chen

Wech

et al. 2014

Geophysical Research Letters

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Deep-seated tectonic tremors have been regarded as an observation tied to interconnected fluids at depth, which have been well documented in worldwide subduction zones and transform faults but not in a collisional mountain belt. In this study we explore the general features of collisional tremors in Taiwan and discuss the possible generation mechanism. In the 4 year data, we find 231 ambient tremor episodes with durations ranging from 5 to 30 min. In addition to a coseismic slip-induced stress change from nearby major earthquake, increased tremor rate is also highly correlated with the active, normal faulting earthquake swarms at the shallower depth. Both the tremor and earthquake swarm activities are confined in a small, area where the high attenuation, high thermal anomaly, the boundary between high and low resistivity, and localized veins on the surfaces distributed, suggesting the involvement of fluids from metamorphic dehydration within the orogen.

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Detecting low‐frequency earthquakes within non‐volcanic tremor in southern Taiwan triggered by the 2005 Mw8.6 Nias earthquake

Cited by 33 publications

References 31 publications

A Global Search for Triggered Tremor Following the 2011 Mw 9.0 Tohoku Earthquake

A Global Search for Triggered Tremor Following the 2011 Mw 9.0 Tohoku Earthquake

Detecting Deep Tectonic Tremor in Taiwan with a Dense Array

Ambient tremors in a collisional orogenic belt

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