Abstract
We estimated the parameters of strong motion generation areas and simulated broadband ground motions for the moderate October 27, 2004 (M w 5.8) and damaging March 4, 1977 (M w 7.4) Vrancea (Romania) intermediate-depth subduction earthquakes using the empirical Green’s function method. The method allows the simulation of ground motions in a broadband frequency range by summing up the subevent records, corresponding to small magnitude events in the near-source areas, which are assumed to follow the source-scaling relationship and the omega-square source spectral model. We first estimated the strong motion generation area that reproduces near-source ground motions in a broadband frequency range of 0.3–10 Hz for the 2004 earthquake, by fitting the synthetic acceleration, velocity, and displacement waveforms to the observed data. The source properties of the obtained strong motion generation area are in agreement with the predictions made using an empirical source scaling relationship for crustal earthquakes, implying a stress drop of approximately 10 MPa for the 2004 earthquake. We then modeled the strong motion generation area for the 1977 damaging earthquake using the 2004 earthquake as an empirical Green’s function and constructing a source model based on its estimated source parameters. To simulate the unique record at Bucharest, capital city of Romania, the rupture was assumed to have propagated from the northeast bottom of the strong motion generation area having a stress drop of 50 MPa. Broadband ground motion simulations were further compared in terms of the modified Mercalli intensity values, calculated from the peak ground accelerations and peak ground velocities of synthetic waveforms, with the observed Medvedev–Sponheuer–Karnik intensity values. Our estimates of the source properties for the 2004 and 1977 Vrancea intermediate-depth earthquakes support the size-dependent stress drop.
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Acknowledgements
The authors would like to thank Changjiang Wu and three anonymous reviewers for their help in improving the manuscript. We are also thankful to the National Center for Seismic Risk Reduction, Bucharest, Romania for providing the strong motion data used in the study. We also acknowledge the use of data from a broadband seismic station (MLR) and the ROMPLUS earthquake catalog of the National Institute for Earth Physics, Romania. We are grateful to Dr. Taiki Saito for providing strong motion data of the INC station for the 1977 earthquake. Discussion with Drs. Toshiaki Yokoi and Nobuo Furukawa helped to improve the study. Some figures were prepared using the GMT plotting tool of Wessel and Smith (1995).
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Poiata, N., Miyake, H. (2018). Broadband Ground Motion Simulation of the 2004 and 1977 Vrancea, Romania, Earthquakes Using Empirical Green’s Function Method. In: Dalguer, L., Fukushima, Y., Irikura, K., Wu, C. (eds) Best Practices in Physics-based Fault Rupture Models for Seismic Hazard Assessment of Nuclear Installations. Pageoph Topical Volumes. Birkhäuser, Cham. https://doi.org/10.1007/978-3-319-72709-7_11
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