Velocitites of Pn-Waves in the Taiwan Strait and Its Surrounding Area From Regional Earthquakes

Huang, Bor‐Shouh; Chen, K. C.; Wang, K. L; Yen, H. Y.

doi:10.3319/tao.1998.9.3.473(taicrust)

Cited by 9 publications

(10 citation statements)

References 6 publications

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“…[17] A number of studies have been completed for the crustal structure [Rau and Wu, 1995;Ma et al, 1996] and Pn velocity [Ma and Song, 1997;Huang et al, 1998] beneath Taiwan. Therefore a simplified single layer over the half space velocity structure for northern Taiwan can be constructed and a focal depth of 28 km estimated from waveform modeling (Ma, personal communication) was used for calculating theoretical travel time curves for each respective phase arrival.…”

Section: Discussionmentioning

confidence: 99%

Strong ground motion and damage in the Taipei basin from the Moho reflected seismic waves during the March 31, 2002, Hualien, Taiwan earthquake

Chen

2003

Geophysical Research Letters

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The March 31, 2002, Hualien offshore earthquake (ML6.8, Mw7.0) caused minor damage near its epicenter but significant damage in Taipei, about 110 km from the epicenter. The recorded PGA values around the Taipei basin vary in a factor of 5. The high‐PGA values in the southeastern part of the basin correspond to the most significant damage area during the earthquake. Strong ground‐motion recordings from this event recorded at stations around the Taipei basin exhibit several distinct large‐amplitude seismic arrivals that can be interpreted as the PmP, SmP and SmS phases. The largest amplitude of the critically reflected S‐wave from the Moho (SmS) and the amplification of soft shallow sediments unique for each site are responsible for the maximum peak ground motion and the significant damage in the Taipei basin during the Hualien offshore earthquake.

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Section: Discussionmentioning

confidence: 99%

Strong ground motion and damage in the Taipei basin from the Moho reflected seismic waves during the March 31, 2002, Hualien, Taiwan earthquake

Chen

2003

Geophysical Research Letters

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“…Chen et al [] conducted a Pn tomography of Taiwan Island using P arrival times of stations in Taiwan. Huang et al [] found regionalized average Pn velocities of Taiwan Strait and Taiwan Island using a few stations in the Taiwan Strait and earthquakes in Taiwan and its eastern offshore. Liang et al [] observed anomalous Pn arrivals at distance as short as 60 km along the suture zone in the eastern Taiwan, suggesting a very thin crust.…”

Section: Introductionmentioning

confidence: 98%

Pn tomography of South China Sea, Taiwan Island, Philippine archipelago, and adjacent regions

Song

2017

JGR Solid Earth

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The South China Sea (SCS) and its surrounding areas are geologically highly heterogeneous from the interactions of multiple plates in Southeast Asia (Eurasian plate, Indian‐Australian plate, Philippine Sea plate, and Pacific plate). To understand the tectonics at depth, here we combined bulletin and handpicked data to conduct Pn tomography of the region. The results show distinct features that are correlated with the complex geology at surface, suggesting a lithosphere‐scale tectonics of the region. Low Pn velocities are found along a belt of the western Pacific transpressional system from the Okinawa Trough and eastern East China Sea, across central and eastern Taiwan orogeny, to the island arcs of the Luzon Strait and the entire Philippine Islands, as well as under the Palawan Island and part of the continental margin north of the Pearl River Basin. High velocities are found under Ryukyu subduction zone, part of the Philippine subduction zone, part of the Eurasian subduction beneath the southwestern Taiwan, and the continent‐ocean boundary between the south China and the SCS basin. The Taiwan Strait, the Mainland SE coast, and the main SCS basin sea are relatively uniform with average Pn values. Crustal thicknesses show large variations in the study region but also coherency with tectonic elements. The Pn pattern in Taiwan shows linear trends of surface geology and suggests strongly lithosphere‐scale deformation of the young Taiwan orogenic belt marked by the deformation boundary under the Western Foothill and the Western Coastal Plain at depth, and the crustal thickness shows a complex pattern from the transpressional collision. Our observations are consistent with rifting and extension in the northern margin of the SCS but are not consistent with mantle upwelling as a mechanism for the opening and the subsequent closing of the SCS. The Philippine island arc is affected by volcanisms from both the Asian and Philippine Sea subductions in the south but mainly from the Asian subduction in the north and under the Luzon Strait.

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“…Later, Huang et al (1998) presented the regionalized P n velocities with 8.2 km/s, 7.9 km/s, and 8.0 km/s for the regions of the Taiwan Strait, Taiwan Island, and Eastern Coastal Range, respectively. Lateral variations of the crustal thickness and upper mantle P-wave velocity were estimated by several studies from 3-D velocity inversion Rau and Wu, 1995;Ma et al, 1996).…”

Section: Introductionmentioning

confidence: 99%

Lateral variations of Pn velocity and anisotropy in Taiwan from travel-time tomography

Chen

Yen

et al. 2014

Earth Planet Sp

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In this study, the P arrivals of 1726 ray paths with the epicentral distances longer than 200 km from 539 earthquakes that occurred in Taiwan are used to investigate the variation of P n velocity. The results show that the lateral variation of P n velocity in Taiwan is quite similar to the pattern of gravity anomaly and strongly related to several features of Taiwan's geological structure. The crust is a little thicker (about 39 km) in the Central Range and somewhat thinner toward the east and west. A relatively thin crust (about 35 km) is obtained in the area of Peikang High; however, an unexpected thick crust of greater than 40 km is also found at the corner of southwestern Taiwan. The degree of anisotropy of P n velocity is found less than 10% and the fast direction is generally in the E-W direction. This direction is parallel to the axis of compressional stress or the direction of plate motion, indicating that the anisotropy results from the deformation of the upper mantle.

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Velocitites of Pn-Waves in the Taiwan Strait and Its Surrounding Area From Regional Earthquakes

Cited by 9 publications

References 6 publications

Strong ground motion and damage in the Taipei basin from the Moho reflected seismic waves during the March 31, 2002, Hualien, Taiwan earthquake

Strong ground motion and damage in the Taipei basin from the Moho reflected seismic waves during the March 31, 2002, Hualien, Taiwan earthquake

Pn tomography of South China Sea, Taiwan Island, Philippine archipelago, and adjacent regions

Lateral variations of Pn velocity and anisotropy in Taiwan from travel-time tomography

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