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Strong motion generation area modelling of the 2008 Iwate earthquake, Japan using modified semi-empirical technique

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The Iwate–Miyagi earthquake (Mw 6.9) of 14 June 2008 is one of the largest intraplate earthquakes that struck north-east Japan. This earthquake has produced the largest peak ground acceleration (PGA) ever recorded. The acceleration values 4022 and 1036 gal were observed at the surface and borehole accelerometers of IWTH25. To understand the cause of this extremely large acceleration, it is highly essential to obtain the detailed rupture process of Iwate–Miyagi earthquake. The present paper estimates the rupture model for this earthquake using the modified semi-empirical technique (MSET). The detailed analysis proposes one strong motion generation area (SMGA) in the rupture plane and nucleation point in the extreme western corner of the SMGA. Using this estimated source model, a satisfactory match is observed between the simulated and actual records. The quantitative analysis of these waveforms provides an almost 1:1 match for PGA values. Furthermore, the variation of these PGA values with epicentral distance shows similar attenuation rate. These results confirm the reliability of MSET and the estimated source model of this earthquake. To the best of our knowledge, this study is the first to model SMGAs in the rupture model using MSET and provides sufficiently reliable information which will be useful for seismic hazard prevention management.

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Acknowledgements

Sandeep is grateful to Prof N P Singh for his valuable suggestions and the Department of Geophysics, Banaras Hindu University, Varanasi for providing the basic research facility. Dr Preeti is thankfully acknowledged for her efforts on improving the quality of manuscript. Data employed in this work were obtained from the KiK-net (website http://www.k-net.bosai.go.jp/k-net/ and USGS (website http://www.usgs.gov/). This research work is a result of the sponsored project ECR/2016/000737 from the Science and Engineering Research Board, DST. PK acknowledges the director of Wadia Institute of Himalayan Geology, Dehradun.

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Correspondence to Parveen Kumar.

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Communicated by Piyush Shanker Agram

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Sandeep, Joshi, A., Devi, S. et al. Strong motion generation area modelling of the 2008 Iwate earthquake, Japan using modified semi-empirical technique. J Earth Syst Sci 128, 202 (2019). https://doi.org/10.1007/s12040-019-1221-7

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  • DOI: https://doi.org/10.1007/s12040-019-1221-7

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