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M w?=?7.8 and its aftershocks including the 12 May 2015 M w?=?7.3 event]]>

机译:<![CDATA [CDATA [在加德满都,尼泊尔喜马拉雅地区的站点效应和Anelastic衰减的确定及其在估计2015年4月25日尼泊尔地震<重点类型=“斜体”> M <下标> W < /subscript>?=?7.8及其余震,包括2015年5月12日<重点类型=“斜体”> m <下标> w ?=?7.3事件]>

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摘要

Abstract The destructive M ~(w)?=?7.8 Nepal earthquake happened in Nepal Himalaya, 80?km NW of Kathmandu city on 25 April 2015. A number of aftershocks in which one of them is M ~(w)?=?7.3 which occurred on 12 May 2015 are observed around the Kathmandu city of Nepal. In this paper, strong motion data of Nepal earthquake and its eight aftershocks having magnitude range 5.3–7.3, recorded at Kathmandu station is used to determine site effects and attenuation factor. Kathmandu city, capital of Nepal, is situated in a valley which consists of sediments of more than 300?m depth. Hence strong motion data recorded at Kathmandu station is strongly affected by site effect and anelastic attenuation. In this work, S-phase spectra recorded at Kathmandu station are corrected for site effect and anelastic attenuation to compute the source parameters of the events. The site effects and anelastic attenuation are estimated from inversion of strong motion data by using the inversion technique suggested by Joshi (Bull Seismol Soc Am 96:2165–2180, 2006a). The shear wave quality factor ( Q ~( β )( f )) is computed at Kathmandu station by using the inversion scheme as Q ~( β )( f )?=?68f_(0.58). The site effects and attenuation factor obtained by inversion technique are used to correct the spectrum for site effect and anelastic attenuation. The corrected source spectrum is compared with theoretical (Brune in J Geophys Res 78:4997–5009, 1970) spectrum to estimate various source parameters. Both horizontal component (North–South and East–West) are utilized to estimate the source parameters of 25 April 2015 M ~(w)?=?7.8 Nepal earthquake and its aftershocks. The best-fit theoretical spectrum provides final values of source parameters, i.e., stress drop, seismic moment, and source radius as 48.7?bars, 5.96?×?10_(27)dyne cm and 37.75?km, respectively, for the 25 April 2015 M ~(w)?=?7.8 earthquake and 1.40?×?10_(27)dyne cm, 44.7?bars, and 23.90?km, respectively, for the 12 May 2015 M ~(w)?=?7.3 earthquake.
机译:摘要破坏性的m〜(w)?= 7.8尼泊尔大地震发生在尼泊尔喜马拉雅,2015年4月25日加德满都市80 km nw。其中一个余震是m〜(w)?=?7.3在2015年5月12日发生的,在加德满都市尼泊尔周围观察到。在本文中,在加德满都站记录的尼泊尔地震的强运动数据及其八个余震5.3-7.3的余震,用于确定现场效应和衰减因子。加德满都市尼泊尔首府,位于山谷中,由300多个沉积物组成的深度。因此,在加德满都站记录的强烈运动数据受到现场效应和Anelastic衰减的强烈影响。在这项工作中,在加德满都站记录的S相谱进行校正为现场效应和Anelastic衰减以计算事件的源参数。通过使用Joshi(公牛Seismol Soc AM 96:2165-2180,2006a)的反转技术,从强运动数据的反转估算了站点效应和振奋衰减。通过使用作为Q〜(f)(f)(f)(f)(f)(f)计算的反转方案在加德满都站计算剪切波质质量因子(q〜(β)(f))。= 68f_(0.58)。通过反转技术获得的现场效果和衰减因子用于校正现场效应和Anelastic衰减的光谱。将校正的源频谱与理论进行比较(j Geophys 78:4997-5009,1970)的理论(relune)谱来估计各种源参数。两个水平组件(南北和东西)都用于估算2015年4月25日的源参数〜(w)?=?7.8尼泊尔地震及其余震。最合适的理论谱提供源参数的最终值,即应力下降,地震时刻和源半径为48.7?棒,5.96?×10_(27)Dyne cm和37.75 km,4月25日2015 m〜(w)?=?7.8地震和1.40?×10_(27)Dyne cm,44.7?酒吧和23.90 km,2015年5月12月12日=(w)?=?7.3地震。

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