DOI: 10.1007/s11069-020-04176-5
论文题名: Simulation of strong ground motion for a potential Mw7.3 earthquake in Kopili fault zone, northeast India
作者: Sutar A.K. ; Verma M. ; Bansal B.K. ; Pandey A.P.
刊名: Natural Hazards
ISSN: 0921030X
出版年: 2020
卷: 104, 期: 1 起始页码: 437
结束页码: 457
语种: 英语
中文关键词: Kappa
; Kopili fault zone
; Peak ground acceleration
; Quality factor
; Stochastic simulation
; Strong ground motion simulation
英文关键词: computer simulation
; earthquake magnitude
; earthquake mechanism
; fault zone
; numerical model
; peak acceleration
; seismic moment
; seismic zone
; seismicity
; strong motion
; India
英文摘要: In this study, we present the results of strong ground motion simulation carried out for a potential earthquake (Mw7.3) in the Kopili source zone of northeast India using the stochastic finite fault modeling technique. Prior to simulation of the potential event, the technique was validated by simulating a recorded earthquake Mw5.3, which was located close to the Nagaon district of Assam, India. The earthquake records (Mw5.3) of ten stations in the study region were analyzed, and average source parameters, namely corner frequency, seismic moment, stress drop and source radius, estimated to be 0.48 Hz, 1.44E + 24 dyne-cm, 103.4 bar and 2.7 km, respectively. While estimating the source parameters, the path attenuation parameters (Q and ko) also constrained at each seismic station. Using the constrained attenuation parameters, site amplification factors and source parameters, we simulated strong ground motion time histories for Mw5.3 event at individual sites and found them comparable with amplitude and frequency content of the respective observed records satisfactorily. The results, therefore, validated the technique used in the study. Further, the fault parameters, site amplification factors and average of the constrained attenuation parameters were used in simulation of the potential event (Mw7.3) and strong ground motion predicted for the entire northeast region (NER) at a grid interval of 0.5°. We used average values of constrained quality factor (Q) and Kappa parameter (ko) equivalent to 182f0.95 and 0.038, respectively, in the simulation. It is apparent that the simulated PGA conditionally followed the attenuation curves of the region, and hence, we suggest developing an appropriate attenuation curve for the NER. The study reveals that the sites located up to 250 km distance away from the source zone may experience significant PGA ranging between 160 Gals and 360 Gals. The cities located within this zone, viz., Tezpur, Nagaon, Udalguri, Diphu and Bomdila, may witness strong to very strong ground shaking associated with substantial damage to buildings and other important structures in the region. © 2020, Springer Nature B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/168759
Appears in Collections: 气候变化与战略
There are no files associated with this item.
作者单位: Borehole Geophysics Research Laboratory, Ministry of Earth Sciences, Karad, Maharashtra, India; Geoscience/Seismology Division, Ministry of Earth Sciences, New Delhi, India; National Centre for Seismology, Ministry of Earth Sciences, New Delhi, India
Recommended Citation:
Sutar A.K.,Verma M.,Bansal B.K.,et al. Simulation of strong ground motion for a potential Mw7.3 earthquake in Kopili fault zone, northeast India[J]. Natural Hazards,2020-01-01,104(1)