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首页> 外文期刊>Pure and Applied Geophysics >Estimation of site response in Kachchh, Gujarat, India, region using H/V spectral ratios of aftershocks of the 2001 M-w 7.7 Bhuj earthquake
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Estimation of site response in Kachchh, Gujarat, India, region using H/V spectral ratios of aftershocks of the 2001 M-w 7.7 Bhuj earthquake

机译：使用2001年Mw 7.7普吉地震余震的H / V谱比估算印度古吉拉特邦Kachchh的场地响应

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摘要

Site response in the aftershock zone of 2001 Bhuj M-w 7.7 earthquake has been studied using the H/V spectral ratio method using 454 aftershocks (M-w 2.5 - 4.7) recorded at twelve three-component digital strong motion and eight three-component digital seismograph sites. The mean amplification factor obtained for soft sediment sites (Quaternary/Tertiary) varies from 0.75 - 6.03 times for 1 - 3 Hz and 0.49 - 3.27 times for 3 - 10 Hz. The mean amplification factors obtained for hard sediment sites ( hard Jurassic/Mesozoic sediments) range from 0.32 - 3.24 times for 1 - 3 Hz and 0.37 - 2.18 times for 310 Hz. The upper bounds of the larger mean amplification factors for 1 - 3 Hz are found to be of the order of 3.13 - 6.03 at Chopadwa, Vadawa, Kavada, Vondh, Adhoi, Jahwarnagar and Gadhada, whereas, the upper bounds of the higher mean amplification factors at 3 - 10 Hz are estimated to be of the order of 2.00 - 3.27 degrees at Tapar, Chopadwa, Adhoi, Jahwarnagar, Gandhidham and Khingarpur. The site response estimated at Bhuj suggests a typical hard-rock site behavior. Preliminary site response maps for 1 - 3 Hz and 310 Hz frequency ranges have been prepared for the area extending from 23 - 23.85 degrees N and 69.65-70.85 degrees E. These frequency ranges are considered on the basis of the fact that the natural frequencies of multi-story buildings (3 to 10 floor) range between 1 - 3 Hz, while the natural frequencies for 1 to 3 story buildings vary from 3 - 10 Hz. The 1 - 3 Hz map delineates two distinct zones of maximum site amplification (> 3 times): one lying in the NW quadrant of the study area covering Jahwarnagar, Kavada and Gadadha and the other in the SE quadrant of the study area with a peak of 6.03 at Chopadwa covering an area of 70 km x 50 km. While the 3 - 10 Hz map shows more than 2 times site amplification value over the entire study area except, NE quadrant, two patches in the southwest corner covering Bhuj and Anjar, and one patch at the center covering Vondh, Manfara and Sikara. The zones for large site amplification values (similar to 3 times) are found at Tapar, Chopadwa, Adhoi and Chobari. The estimated site response values show a good correlation with the distribution of geological formations as well as observed ground deformation in the epicentral zone.
机译：使用H / V频谱比方法，使用454次余震（M-w 2.5-4.7）记录在12个三分量数字强震和8个三分量数字地震仪现场，研究了2001年普吉7.7级地震余震区的场地响应。对于软沉积物位点（第四纪/第三纪）获得的平均放大因子在1-3 Hz时为0.75-6.03倍，在3-10Hz时为0.49-3.27倍。对于硬质沉积物位点（硬质侏罗纪/中生代沉积物）获得的平均放大因子范围为：1-3 Hz为0.32-3.24倍，而310 Hz为0.37-2.18倍。在Chopadwa，Vadawa，Kavada，Vondh，Adhoi，Jahwarnagar和Gadhada，发现1-3 Hz的较大平均扩增因子的上限约为3.13-6.03，而较高平均扩增的上限在Tapar，Chopadwa，Adhoi，Jahwarnagar，Gandhidham和Khingarpur，3-10 Hz的因子估计约为2.00-3.27度。 Bhuj估计的场地响应表明典型的硬石场地行为。已经为从23-23.85度N和69.65-70.85度E延伸的区域准备了1-3 Hz和310 Hz频率范围的初步站点响应图。考虑到这些频率范围是基于以下事实：多层建筑物（3到10层）的范围在1-3 Hz之间，而1-3层建筑物的固有频率则在3-10 Hz之间。 1-3 Hz的图描绘了两个最大区域扩增的不同区域（> 3倍）：一个位于研究区域的西北象限，覆盖了贾瓦瓦纳加尔，卡瓦达和加达达，另一个位于研究区域的SE象限，具有峰值Chopadwa的6.03覆盖面积70 km x 50 km。尽管3-10 Hz图显示了整个研究区域的放大倍数，但NE象限除外，西南角的两个斑块覆盖了Bhuj和Anjar，中心的一个斑块覆盖了Vondh，Manfara和Sikara。在Tapar，Chopadwa，Adhoi和Chobari发现了较大的站点扩增值区域（大约3倍）。估计的场地响应值与地质构造的分布以及在震中区观察到的地面变形具有良好的相关性。

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