Site classification and Vs30 estimation of free-field TSMIP stations using the logging data of EGDT

Kuo, Chia-Wei; Wen, Kun-Li; Hsieh, Hung Hao; Lin, Ching-Yang; Chang, Tao Ming; Kuo, Kai Wen

doi:10.1016/j.enggeo.2012.01.013

Cited by 81 publications

(45 citation statements)

References 25 publications

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“…10. Results show that most of the characteristics of synthetic waveforms were comparable to the observations for the Kuo et al, 2012), and large-scale 3D wave-speed heterogeneity information . Background colors show the V s velocity, the slowest V s in the mesh is 443 m/s period between 10 and 50 s. The waveforms observed in northern Taiwan (e.g., stations TWB1, TWY, TWC) are generally characterized by stronger amplitudes and less complex later phases compared to those in eastern, western, and southern Taiwan.…”

Section: Island-wide Waveform Comparisonsupporting

confidence: 58%

“…This model covers most of the land and offshore areas of Taiwan, which is capable of handling large earthquakes from offshore regions like 0420 event. Most of the currently available relevant seismological and geological information have incorporated in the model, including surface topography, shallow sedimentary (V s 30; Kuo et al, 2012), and largescale 3D wave-speed heterogeneity information. The surface topography based on 40-m digital elevation model data is implemented at the top of the SEM mesh model (Lee et al, 2009).…”

Section: Methodsmentioning

confidence: 99%

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Numerical earthquake model of the 20 April 2015 southern Ryukyu subduction zone M6.4 event and its impact on seismic hazard assessment

Lee

2015

Earth Planet Sp

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The M6.4 earthquake that took place on the 20 April 2015 off the shore of eastern Taiwan was the largest event in the vicinity of Taiwan during 2015. The mainshock was located in the southern Ryukyu subduction zone, which is the interface between the Philippine Sea Plate and the Eurasian Plate. People in Taipei experienced strong ground shaking for more than 40 s, even though the epicenter was located more than 150 km away. In order to understand the origin of ground motions from this earthquake and how it caused such strong shaking in Taipei, a numerical earthquake model is analyzed, including models of source rupture and wave propagation. First, a joint source inversion was performed using teleseismic body wave and local ground motion data. Source inversion results show that a large slip occurred near the hypocenter, which rapidly released seismic energy in the first 2 s. Then, the rupture propagated toward the shallow fault plane. A large amount of seismic energy was released during this rupture stage that slipped for more than 8 s before the end of the rupture. The estimated stress drop is 2.48 MPa, which is consistent with values for subduction zone earthquakes. Forward simulation using this inverted source rupture model and a 3D seismic velocity model based on the spectral-element method was then performed. Results indicate that the strong ground motion in Taipei resulted from two factors: (1) the Taipei basin amplification effect and (2) the specific source radiation pattern. The results of this numerical earthquake model imply that future subduction zone events that occur in offshore eastern Taiwan are likely to cause relatively strong ground shaking in northern Taiwan, especially in the Taipei metropolitan area.

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Section: Island-wide Waveform Comparisonsupporting

confidence: 58%

Section: Methodsmentioning

confidence: 99%

Numerical earthquake model of the 20 April 2015 southern Ryukyu subduction zone M6.4 event and its impact on seismic hazard assessment

Lee

2015

Earth Planet Sp

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“…10). Considering the site corrections for each station (Kuo et al 2011(Kuo et al , 2012, all of the simulated PGA values were found to be lower than the PGA values predicted using the GMPE. In the simulations for high-frequency components using EGFM we ignored the inelastic attenuation effects, which might be one of the reasons why the simulated PGA values are smaller than those derived from GMPE.…”

Section: Peak Ground Accelerationmentioning

confidence: 99%

1909 Taipei Earthquake Ground Motion Simulation

Liao

Yen

Lee

et al. 2016

Terr. Atmos. Ocean. Sci.

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The 1909 Taipei earthquake (M 7.3) occurred beneath the Taipei metropolitan area (TMA) causing substantial damage according to the historical literature. According to the hypocenter relocation and tectonic implications provided in a previous study, we simulated ground motions within the TMA using a hybrid simulation method involving the spectral-element method (SEM) and the empirical Green's function method (EGFM). We used the SEM for simulating low-frequency components and the EGFM for simulating high-frequency components. These high and low frequency components were subsequently combined. For the EGFM we used the records from a recent M L 4.9 earthquake (11 October 2013, depth = 143.8 km) in the Taipei area as the empirical Green's function. According to the historical literature, the observed PGA (peak ground acceleration) values are 59.2 and 67.0 gal at ancient stations TAP and KEE, with periods of 1.21 and 1.34 s, respectively. By comparing the simulated PGA values at modern stations TAPB and WFSB to the historical documented ones for 12 different models, our result suggests that the 1909 Taipei earthquake was an event with a magnitude of about M w 7.3 and stress drop of approximately 30 bars, or a smaller equivalent magnitude between M w 6.8 -7.3 but with much higher average stress drop of more than 100 bars. For a deep event beneath TMA a larger vertical P-wave motion and longer period shaking wave, as addressed in the historical literature, might be expected with prolonged shaking as found in the simulation. A seismic hazard assessment is necessary for metropolitan Taipei to better understand the long period shaking from deep subduction zone intra plate events.

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“…The largest PGA was recorded by station TCU129 and reached about 400 gal near the epicenter. Although this high PGA was considered to be the effect of a faulty concrete recording pier at TCU129 (Wen et al 2001) rather than the short epicentral distance or local seismic site condition (Kuo et al 2012), some nearby stations also observed PGA greater than 200 gal.…”

Section: Data and Analysismentioning

confidence: 99%

Seismogenic Structure Beneath Décollement Inferred from 2009/11/5 ML 6.2 Mingjian Earthquake in Central Taiwan

Lin

Chang

Wen

et al. 2014

Terr. Atmos. Ocean. Sci.

Self Cite

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One decade after the 1999 Chi-Chi earthquake, central Taiwan experienced more strong ground shaking [Central Weather Bureau (CWB), intensity VII] induced by a M L 6.2 earthquake on 5 th November 2009. This earthquake occurred in the Mingjian Township of Nantou County, only 12 km southwest of the Chi-Chi earthquake epicenter. The broadband microearthquake monitoring network operated by the National Center for Research on Earthquake Engineering (NCREE) observed numerous aftershocks in the five days following the mainshock. The relocated aftershocks and the mainshock focal mechanism indicated a NE-SW striking fault dipping 60° toward the northwest. This fault plane is inside the pre-Miocene basement and the rupture extends from the lower crust to 10 km depth just beneath the basal décollement of the thin-skinned model that is generally used to explain the regional tectonics in Taiwan. The fault plane is vertically symmetrical with the Chelungpu fault by the basal décollement. The NW-SE compressive stress of plate collision in Taiwan, as well as the deep tectonic background, resulted in the seismogenic structure of the Mingjian earthquake at this location.

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Site classification and Vs30 estimation of free-field TSMIP stations using the logging data of EGDT

Cited by 81 publications

References 25 publications

Numerical earthquake model of the 20 April 2015 southern Ryukyu subduction zone M6.4 event and its impact on seismic hazard assessment

Numerical earthquake model of the 20 April 2015 southern Ryukyu subduction zone M6.4 event and its impact on seismic hazard assessment

1909 Taipei Earthquake Ground Motion Simulation

Seismogenic Structure Beneath Décollement Inferred from 2009/11/5 ML 6.2 Mingjian Earthquake in Central Taiwan

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