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SZ4D International Webinars: Science and hazard mitigation with seafloor
geodesy in Taiwan

Ya-Ju Hsu - Research Fellow at Institute of Earth Sciences, Academia Sinica

March 25th, 2021 at 4 PM PST

Zoom Webinar
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Taiwan is bounded by the 2200-km long Ryukyu subduction zone to the north
and the 1100-km long Manila subduction zone to the south. The convergence
rate across the Taiwan plate boundary is close to 90 mm/yr; whereas
historic records document infrequent large earthquakes (M>8) over the past
few hundred years. On the other hand, geological records across the South
China Sea have reported more than one hundred tsunami events. Attempts to
study megathrust earthquakes and tsunamis from these two subduction zones
have obtained different results due to insufficient data. Recent
development of seafloor geodetic techniques in Taiwan provides a means to
evaluate the spatial extent of locked fault zones and creeping segments on
the plate interface, the fraction of fault slip released seismically, and
the magnitude of potential destructive subduction zone earthquakes.

In this talk, I will give an overview of the Taiwan seafloor geodetic array
which consists of GNSS-acoustic stations, seafloor pressure gauges (APGs)
and ocean-bottom seismometers. I then present data collected by the
GNSS-acoustic technique and APGs along the southern Ryukyu Trench. I
speculate that the cumulative strain is possibly partitioned between large
dextral strike-slip faults in the accretionary wedge and thrust faults on
the plate interface. Due to a low-angle plate interface at shallow depths,
seafloor vertical movements may be difficult to be detected by APGs.

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