Stress Diffusion and Spatial Migration of Aftershocks in the Hualien Area, Taiwan

Yu, Tsu-Wei; Cheng, Shih Nan

doi:10.3319/tao.1997.8.1.31(t)

Cited by 2 publications

(3 citation statements)

References 11 publications

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“…They argued that this rapid stress change might be related to the crustal material rich in quartz or water. Also, as predicted by Yu and Cheng (1997), the recurrence time of large earthquakes is ∼20-30 yrs, due to the short relaxation time. Based on historical records, the large earthquakes that occurred in 1951,1986, and 2018 indicate a recurrence time of 30 yrs in this area.…”

Section: Discussionmentioning

confidence: 61%

“…But these two examples show a long postseismic stress-relaxation time compared with that of the 2018 Hualien earthquake. However, the phenomenon of the 2018 Hualien earthquake is similar that of the 1986 Hualien earthquake (Yu and Cheng, 1997). Yu and Cheng (1997) showed a short relaxation time of asthenosphere from numerical modeling based on the migration pattern and short time duration (tens of day) of aftershocks of 1986 Hualien earthquake reported by (Liaw et al, 1986).…”

Section: Discussionmentioning

confidence: 63%

“…However, the phenomenon of the 2018 Hualien earthquake is similar that of the 1986 Hualien earthquake (Yu and Cheng, 1997). Yu and Cheng (1997) showed a short relaxation time of asthenosphere from numerical modeling based on the migration pattern and short time duration (tens of day) of aftershocks of 1986 Hualien earthquake reported by (Liaw et al, 1986). They argued that this rapid stress change might be related to the crustal material rich in quartz or water.…”

Section: Discussionmentioning

confidence: 63%

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Aftershock Sequence of the 2018 Mw 6.4 Hualien Earthquake in Eastern Taiwan from a Dense Seismic Array Data Set

Kuo-Chen

Guan

Sun

et al. 2018

Seismological Research Letters

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The February 2018 M w 6.4 earthquake in eastern Taiwan caused extensive damage in Hualien City. Although damaging earthquakes are common in this region, there are relatively few permanent seismic stations deployed. Two days after the mainshock, we deployed 70 temporary seismic stations around Hualien City for 12 days (8-19 February), and station spacing was 1-5 km. During this time, 2192 aftershocks were located from which 580 focal mechanisms were determined. The aftershock sequence extended about 25 km southwestward from the epicenter of the mainshock into the Longitudinal Valley and to depths between 5 and 15 km. Earthquake hypocenters indicate that the aftershocks took place along a near-vertical to steeply west-dipping plane in the north that becomes more diffuse in the south. Focal mechanisms are predominantly extensional, different than the left-lateral strike slip with thrust-component faulting of the mainshock. Very few events occurred in the uppermost crust at depths of less than 5 km, and their focal mechanisms are left-lateral strike-slip faulting. From the mainshock to the aftershocks, the stress changed rapidly from a north-northwest-oriented compressional axis (P axis) to the same direction for the extensional axis (T axis). Electronic Supplement: Tables of aftershocks and focal mechanisms obtained in this study and figures of M w determination via manual spectral analysis and result of automatic spectral analysis.

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Section: Discussionmentioning

confidence: 61%

Section: Discussionmentioning

confidence: 63%