TY - JOUR
T1 - Time-dependent shake map for Uttarakhand Himalayas, India, using recorded earthquakes
AU - Mittal, Himanshu
AU - Wu, Yih Min
AU - Lin, Ting Li
AU - Legendre, Cédric P.
AU - Gupta, Sushil
AU - Yang, Benjamin M.
N1 - Funding Information:
The authors are profusely thankful to the Ministry of Science and Technology of the Republic of China for funding the project, under which this study was carried out. The author (HM) is really thankful to Dr. Wei-An Chao for providing his code to estimate focal mechanism. GMT software from Wessel and Smith ( 1998 ) is used in the plotting part of the figures and is gratefully acknowledged.
Publisher Copyright:
© 2019, Institute of Geophysics, Polish Academy of Sciences & Polish Academy of Sciences.
PY - 2019/6/1
Y1 - 2019/6/1
N2 - Uttarakhand Himalayas are highly sensitive to seismic hazard with possible occurrence of high-magnitude earthquakes. Fewer waveforms are available from previously recorded earthquakes, which are insufficient for carrying out seismic hazard studies. The recently installed strong motion instrumentation network (SMIN) in India, particularly, in Indian Himalayas is providing useful data. Using recorded data from SMIN, time-dependent peak ground acceleration and observed peak ground velocity shake maps are drawn for two earthquakes widely recorded by SMIN in Uttarakhand region of Indian Himalayan belt. Open-source Earthworm software with new algorithms is used for drawing these shake maps. The source mechanism is computed for April 4, 2011 earthquake using waveform inversion technique to relate it to the trend of shake maps. The computed focal mechanism shows one of the nodal planes in NW–SE, which are consistent with shake maps for the same earthquake. These time-dependent plotted shake maps provide useful information on the initial rupture, as well as the potential directivity of the rupture.
AB - Uttarakhand Himalayas are highly sensitive to seismic hazard with possible occurrence of high-magnitude earthquakes. Fewer waveforms are available from previously recorded earthquakes, which are insufficient for carrying out seismic hazard studies. The recently installed strong motion instrumentation network (SMIN) in India, particularly, in Indian Himalayas is providing useful data. Using recorded data from SMIN, time-dependent peak ground acceleration and observed peak ground velocity shake maps are drawn for two earthquakes widely recorded by SMIN in Uttarakhand region of Indian Himalayan belt. Open-source Earthworm software with new algorithms is used for drawing these shake maps. The source mechanism is computed for April 4, 2011 earthquake using waveform inversion technique to relate it to the trend of shake maps. The computed focal mechanism shows one of the nodal planes in NW–SE, which are consistent with shake maps for the same earthquake. These time-dependent plotted shake maps provide useful information on the initial rupture, as well as the potential directivity of the rupture.
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U2 - 10.1007/s11600-019-00281-7
DO - 10.1007/s11600-019-00281-7
M3 - Article
AN - SCOPUS:85071722901
SN - 1895-6572
VL - 67
SP - 753
EP - 763
JO - Acta Geophysica
JF - Acta Geophysica
IS - 3
ER -