Tomographic imaging of lithospheric structures under Taiwan

Rau, R.; Wu, Francis T.

doi:10.1016/0012-821x(95)00076-o

Cited by 210 publications

(237 citation statements)

References 19 publications

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“…For the six stations investigated, the resulting simplified models provide an average estimate of 38 km for the Moho thickness surrounding the Central Range of Taiwan. Also, the individual station estimates compare well with the recent tomographic model of RAU and WU (1995) and the refraction results of MA and SONG (1997). …”

supporting

confidence: 72%

Crustal Structure Beneath Taiwan Using Frequency-band Inversion of Receiver Function Waveforms

Tomfohrde

Nowack

2000

Pure appl. geophys.

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-Receiver function analysis is used to determine local crustal structure beneath Taiwan. We have performed preliminary data processing and polarization analysis for the selection of stations and events and to increase overall data quality. Receiver function analysis is then applied to data from the Taiwan Seismic Network to obtain radial and transverse receiver functions. Due to the limited azimuthal coverage, only the radial receiver functions are analyzed in terms of horizontally layered crustal structure for each station. In order to improve convergence of the receiver function inversion, frequency-band inversion (FBI) is implemented, in which an iterative inversion procedure with sequentially higher low-pass corner frequencies is used to stabilize the waveform inversion. Frequency-band inversion is applied to receiver functions at six stations of the Taiwan Seismic Network. Initial 20-layer crustal models are inverted for using prior tomographic results for the initial models. The resulting 20-1ayer models are then simplified to 4 to 5 layer models and input into an alternating depth and velocity frequency-band inversion. For the six stations investigated, the resulting simplified models provide an average estimate of 38 km for the Moho thickness surrounding the Central Range of Taiwan. Also, the individual station estimates compare well with the recent tomographic model of RAU and WU (1995) and the refraction results of MA and SONG (1997).

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supporting

confidence: 72%

Crustal Structure Beneath Taiwan Using Frequency-band Inversion of Receiver Function Waveforms

Tomfohrde

Nowack

2000

Pure appl. geophys.

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“…The other seis mic ob ser va tion (B-B') along the west ern coast of Tai wan is ob tained from tomographic in ver sion by jointly us ing the seis mic data set of the CWBSN and two tem po rary seis mic ar rays in Hualien and Pingtung (Kim et al 2005). We as sume that the Vp = 7.5 km s -1 , taken as the av er age ve loc ity of three seis mic tomography re sults (Rau and Wu 1995;Ma et al 1996;Wu et al 2007), is the dis con tin ued in ter face be tween the lower crust and up per man tle. The depth of in ter face es ti mated from the ve loc ity struc tures range from 32 to 34 km (Fig.…”

Section: Moho Depth and Discussionsmentioning

confidence: 99%

Moho Depth Derived from Gravity Data in the Taiwan Strait Area

Hsieh

Yen²,

Shih

2010

Terr. Atmos. Ocean. Sci.

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AB STRACTWe have con structed a re gional Bouguer grav ity anom aly map us ing ma rine and land data from Tai wan and the Chi nese prov ince of Fuchien, as well as SEASAT altimetry-de rived grav ity data for the Tai wan Strait and its sur round ing area. The map shows isogals trending gen er ally in a NE-SW di rec tion, con form ing with the over all shal lower geo log i cal strike of the strait. Re mov ing grav ity ef fects gen er ated by the wa ter layer and seafloor to pog ra phy, the re gional Bouguer grav ity anom aly is ob tained, re flect ing the subsurface struc ture. Moho depth is then com puted by the Parker-Oldenburg it er a tive method from the re gional Bouguer grav ity data set. Over the strait area, the ge om e try of the Moho re lief is smooth with an av er age depth of about 30 km, ex cept for the Penghu up lift. Moho depth is shal lower in the Tai wan Strait and thick ens to ward both sides of the strait. The rel a tively shal lower Moho depth, reach ing up to 28 km, is con vex up ward un der neath the Penghu uplift.

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“…More than 500 M L ≥ 3.0 earthquakes recorded by the CWBSN from 1991 to 2010 were selected for northwestern Taiwan. These earthquakes were relocated using a previously published 3D velocity model (Rau and Wu 1995) (Fig. 3).…”

Section: Earthquake Data Analysesmentioning

confidence: 99%

Tiechanshan-Tunghsiao anticline earthquake analysis: Implications for northwestern Taiwan potential carbon dioxide storage site seismic hazard

Rau¹,

Yang²,

Kang³

2017

Terr. Atmos. Ocean. Sci.

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We analyze the seismicity and earthquake focal mechanisms beneath the Tiechanshan-Tunghsiao (TCS-TH) anticline over the last two decades for seismic hazard evaluation of a potential carbon dioxide storage site in northwestern Taiwan. Seismicity in the TCS-TH anticline indicates both spatial and temporal clustering at a depth range of 7 -12 km. Thirteen 3.0 ≤ M L ≤ 5.2 earthquake focal mechanisms show a combination of thrust, strike-slip, and normal faulting mechanisms under the TCS-TH anticline. A 1992 M L 5.2 earthquake with a focal depth of ~10 km, the largest event ever recorded beneath the TCS-TH anticline during the last two decades, has a normal fault mechanism with the T-axis trending NNE-SSW and nodal planes oriented NNW-SSE, dipping either gently to the NNE or steeply to the SSW. Thrust fault mechanisms that occurred with mostly E-W or NWW-SEE striking P-axes and strike-slip faulting events indicate NWW-SEE striking P-axes and NNE-SSW trending T-axes, which are consistent with the regional plate convergence direction. For the strike-slip faulting events, if we take the N-S or NNW-SSE striking nodal planes as the fault planes, the strike-slip faults are sinistral motions and correspond to the Tapingting fault, which is a strike-slip fault reactivated from the inherited normal fault and intersects the Tiechanshan and Tunghsiao anticlines.

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Tomographic imaging of lithospheric structures under Taiwan

Cited by 210 publications

References 19 publications

Crustal Structure Beneath Taiwan Using Frequency-band Inversion of Receiver Function Waveforms

Crustal Structure Beneath Taiwan Using Frequency-band Inversion of Receiver Function Waveforms

Moho Depth Derived from Gravity Data in the Taiwan Strait Area

Tiechanshan-Tunghsiao anticline earthquake analysis: Implications for northwestern Taiwan potential carbon dioxide storage site seismic hazard

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