Yi-Ying Wen

Fault geometry and distribution of asperities of the 1997 Manyi, China (Mw = 7.5), earthquake: Integrated analysis from seismological and InSAR data

[1] The integration of seismic and InSAR interferogram data allows us to have a comprehensive understanding of the earthquake fault geometry and distribution of asperities for a remote event, namely the 1997 Manyi, China earthquake. We first obtained the slip distribution from teleseismic stations for several fault models, and then made synthetic interferograms in order to determine the optimum fault geometry. Our results show that the 1997 Manyi earthquake ruptured bilaterally with two segments dipping north and south for the western and eastern segments, respectively. The south dip of the eastern segment is essential for a better interpretation of the stations near the nodal plane, and a reversal of dip between the west and east segment is necessary to explain the pattern of observed InSAR interferograms due to the broader distribution of asperities. The fault rupture extended 170 km with maximum displacement of 6.1 m, and a total seismic moment of 2.24*10 20 Nm (Mw = 7.5).

Multiple‐Fault, Slow Rupture of the 2016 Mw 7.8 Kaikōura, New Zealand, Earthquake: Complementary Insights from Teleseismic and Geodetic DataMultiple‐Fault, Slow Rupture of the 2016 Kaikōura Earthquake

We investigate the complex rupture properties of the 2016 Mw 7.8 Kaikoura earthquake by jointly inverting teleseismic body-wave and regional Global Positioning System (GPS) coseismic deformation data within a multifault model. We validate our results by forward modeling recorded Interferometric Synthetic Aperture Radar (InSAR) interferograms. Our study reveals the complementary depthdependent contributions of teleseismic and local geodetic data to the cumulative slip distribution. The resulting joint inversion model of the rupture process and slip pattern explains both the far-field (teleseismic data) and near-field (GPS and InSAR data) observations. The model highlights variable rupture velocity throughout the sequence, with an initial high-velocity (2:25 km=s) pulse followed by slow (∼1:5 km=s) yet significant reverse and transverse motion on faults stretching at least 160 km to the north of the origin. We map significant thrust motion on a dipping plane representing the combined effects of the Hope, Hundalee, and Jordan thrust faults as well as large strike-slip motion along the Kekerengu and Needles faults. The mainshock also ruptured the deep portion of the subduction interface at a velocity of 1:0 km=s.

Source characteristics of moderate-to-strong earthquakes in the Nantou area, Taiwan: insight from strong ground motion simulations

Abstract In Taiwan, the Nantou area is a seismically active region where several moderate events have occurred, causing some disasters during the past century. Here, we applied the strong ground motion simulation with the empirical Green’s function method to investigate the source characteristics for the eight moderate blind-fault events that struck the Nantou area in 1999 and 2013. The results show that for these Nantou events, a high stress drop and focal depth dependence were noted, which might be related to the immature buried fault in this area. From the viewpoint of seismic hazard prevention and preparation, future earthquake scenarios that include high stress drop should be applied to more analyses, especially the moderate-to-large events originating from the immature blind faulting.Graphical abstract.