Qp-Qs relations in the sedimentary basin of the upper Mississippi Embayment using converted phases. Bulletin of the Seismological Society of America, 100(3), 1363–1369.Ĭhen, K. Basement imaging using SP converted phases from a dense strong-motion array in Lan-Yang plain, Taiwan. Weakness of the San Andreas Fault revealed by samples from the active fault zone. Bulletin of the Seismological Society of America, 69(1), 207–220.Ĭarpenter, B. The JTangshan, China earthquake-A complex sequence of intraplate events. Shear velocity structure of Abyssal Plain sediments in Cascadia. Physics of the Earth and Planetary Interiors, 281, 46–54.īell, S. Shallow structure of the Tangshan fault zone unveiled by dense seismic array and horizontal-to-vertical spectral ratio method. Journal of Asian Earth Sciences, in press.īao, F., Li, Z., Yuen, D., Zhao, J., Ren, J., & Tian, B. Sediment thickness variations of the Tangshan fault zone in North China from a dense seismic array and microtremor survey. Bulletin of the Seismological Society of America, 94(1), 53–63.īao, F., Li, Z., Tian, B., Wang, L., & Tu, G. S-Wave Velocity Profiling by Inversion of Microtremor H/V Spectrum. The relocation of microearthquakes in the northern Mississippi Embayment. Our study suggests that the proposed simple and efficient method of using converted waves could be applied to other populous plains or basins with high seismic activity and could be used to determine the general characteristics of the sediment structures in a given study area.Īndrews, M. The obtained sediment thickness map provides beneficial information for ensuring the safe construction of infrastructure in Tangshan city and can serve as an important model for simulating earthquake strong ground motions in the Tangshan earthquake region. The sediment thicknesses indicate that the subsurface sedimentary structure throughout the Tangshan earthquake region has experienced significant transformations over time, partially controlled by the NE–SW-trending Tangshan Fault. Overall, the measurements from the local converted wave method are consistent with those of previous microtremor horizontal-to-vertical spectral ratio studies. With this method, we generated a sediment thickness map of the Tangshan earthquake region. A synthetic seismogram analysis clearly showed that the travel-time differences between direct S and Sp converted waves or between direct P and Ps converted waves were almost linearly correlated with the sediment thicknesses, providing tight constraints on the basement depth. Tens of local events with magnitudes between M L 0.1 and M L 2.4 were adequately recorded by the Tangshan dense seismic array and were accurately relocated. From January to March 2017, we deployed 145 three-component seismographs with inter-station distances ranging between 1 and 4 km throughout the Tangshan earthquake region. To investigate the sediment structures within the Tangshan earthquake region in North China, we developed an effective and inexpensive method for reliably detecting the thickness of Quaternary sediments by using converted waves from local, small earthquakes recorded by a dense seismic array.
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