Tectonic implications on the 2018 Hualien Earthquake

Wen, Strong; Wen, Yi-Ying; Ching, Kuo En; Yeh, Yu-Lien; Lee, Yuan Hsi

doi:10.3319/tao.2019.01.28.01

Cited by 12 publications

(7 citation statements)

References 30 publications

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“…which is buried beneath the Longitudinal Valley fault for the northernmost LV (Shyu et al 2005(Shyu et al , 2006. Wen et al (2019) suggested that the 2018 Hualien earthquake may be associated with a west-dipping blind fault which could reach out to the Heping sea basin and might belong to the Central Range fault. Figure 8 shows the locations of the 2000 Hualien event and its aftershocks, which correlate well with the 2018 Hualien mainshock and its aftershocks.…”

Section: Discussionmentioning

confidence: 99%

The kinematic source analysis for 2018 Mw 6.4 Hualien, Taiwan earthquake

Wen

Lee

et al. 2019

Terr. Atmos. Ocean. Sci.

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The 2018 M w 6.4 Hualien earthquake struck the eastern Taiwan and caused serious damage. We investigate the rupture properties of the 2018 Hualien earthquake by inverting teleseismic body wave and forward modeling GPS coseismic deformation. The rupture process and slip pattern of preferred model explain both the far-field (teleseismic data) and near-field (GPS) observations. The results show that the 2018 Hualien mainshock ruptured southward on two fault segments, with a weak but fast initiation (3.0 km s -1 ) in the main west-dipping segment F1 and slow (2.0 km s -1 ) yet significant slip on shallow east-dipping segment F2. In the past few years, several moderate-sized events, which struck eastern Taiwan and caused strong ground shaking and some seismic damage, are considered occurring on the west-dipping fault. Additional investigations are required to building up the knowledge of this not wellknown region.

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Section: Discussionmentioning

confidence: 99%

The kinematic source analysis for 2018 Mw 6.4 Hualien, Taiwan earthquake

Wen

Lee

et al. 2019

Terr. Atmos. Ocean. Sci.

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“…In other words, the rupture velocity varied from sea to land during the earthquake. Such variation might be associated with local velocity structures, where there is relatively lower velocity structures on land (Huang et al 2014;Wen et al 2019).…”

Section: Discussionmentioning

confidence: 99%

Multiple-event analysis of the 2018 ML 6.2 Hualien earthquake using source time functions

Hwang¹,

Lin²,

Chang³

et al. 2019

Terr. Atmos. Ocean. Sci.

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Through forward multiple-event analysis of teleseismic P-waves using source time functions (STFs), derived by non-negative time-domain deconvolution, we inferred the rupture features of the 2018 Hualien earthquake. At least six sub-events composed the Hualien earthquake, with the largest one (corresponding to M w = 6.3) occurring 4.8 s later than the initiation of rupture. The total seismic moment (M 0 ) of 6.48 × 10 18 Nm (M w = 6.5) and radiated seismic energy (E S ) of 1.76 × 10 14 Nm led to the E S /M 0 ratio ~2.72 × 10 -5 . A static stress drop (∆σ S ) of 5.03 MPa was also derived for the earthquake. On average, the rupture parameters of the 2018 Hualien earthquake from this study were similar to globally average values. From M 0 and source duration (10.9 s), this implied an average rupture velocity (Vr) less than 2.0 km s -1 . The forward multiple-event modeling showed that ∆σ S varied with the sub-events and increased with E S /M 0 to imply the frictional strength being heterogeneous along the fault. From the highest STF peak (6.9 s after the initiation) near the land-sea interface, we suggested that the Hualien earthquake be divided into two rupture processes. One with low ∆σ S , low E S /M 0 , and high Vr occurred at sea; the other with high ∆σ S , high E S /M 0 , and low Vr occurred on land. Both seawater and local velocity structures probably played crucial factors behind these rupture discrepancies during the 2018 Hualien earthquake.

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“…After examining the possible trade-off and ambiguities in solutions, the results show that the main asperity, with strong left-lateral slip, is right underneath Milun Fault where the major damage and the centroid location of regional moment tensor located. Wen et al (2019a) focused on the local background structure of the region and its relation with the 2018 Hualien earthquake. This article presents a comprehensive seismological analysis including 3-D tomographic inversion, earthquake relocation, and focal mechanism determination in the Hualien region.…”

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confidence: 99%