2016/02/05 Meinong sequence data
5 February 2016 Mw 6.4 Meinong, Taiwan earthquake sequence
An important question of earthquake science is to what extent fluids such as water play an important role in modulating seismicity. Here, we provide evidence for fluid migration during the 2016 Meinong, Taiwan, aftershock sequence, occurring at 10–20 km depth within a classic fold‐and‐thrust belt. We find high Vp/Vs ratios, characteristic of highly fluid saturated regions, in the Meinong aftershock region and that the Vp/Vs ratios in the central aftershock region change with time during the aftershock sequence. The results suggest that fluid processes play a critical role in regulating seismicity in a classic continental collision tectonic setting and may also have a role in modifying earthquake hazards more generally.
Figure: Map of stations and the relocated Meinong earthquake sequence (left). The stations and events are denoted by the triangle and dot. The red lines are active faults. The black lines denote the cross sections shown in the right, where the upper and lower panels show the distribution of the Meinong earthquake sequence before and after 3D-DD relocation in two cross-sections. The background shows Vp/Vs ratio variations from a tomographic model of Huang et al. (2014).
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Citation
Hsu, Y.-F., H.-H. Huang*, M.-H. Huang, V. C. Tsai, R. Y. Chuang, K.-F. Feng, and S.-H. Lin (2020), Evidence for Fluid Migration During the 2016 Meinong Taiwan Aftershock Sequence, J. Geophys. Res.,125, e2020JB019994. https://doi.org/10.1029/2020JB019994.