We have studied a moderate earthquake of February 06, 2017 occurred in Rudraprayag, Uttarakhand of northwest Himalaya that created prominent ground shakings not only around the epicentral region but also to far distances in different parts of the National Capital Territory (NCT) of Delhi, which is an unusual experience. Full waveform inversion and source study suggest, moment magnitude of the event to be Mw 5.5 with the centroid depth of 19 km. The waveform analysis also reveals the oblique faulting mechanism associated with the down-dip apex of the detachment. The source parameters, namely, source radius, stress drop, and seismic moment of the event have been estimated to be 2.3 km, 63 bars, and 2.05 E + 17N-M respectively. The epicenter of the event falls in the seismically active zone between two major thrusts of the Himalaya, viz., Main Boundary Thrust (MBT) and Main Central Thrust (MCT). In the present study, strong ground motion was simulated using Empirical Green’s Function (EGF) approach for a scenario earthquake of Mw6.8 magnitude in the same source, considering it similar to the Chamoli earthquake (M 6.8) of March 29, 1999 that had occurred in the neighborhood. The peak ground acceleration (PGA) has been estimated at the recording sites and a contour map is generated for the entire study region, covering the cities located up to ∼ 700 km from the source. The predicted strong ground motion varies between 22 gals to 352 gals within the epicentral region up to ∼ 150 km, which may lead to moderate to severe ground shaking. However, weak to light shaking expected in the remaining parts of the study region with PGA ranging between (0.50–22) gals.

中文翻译：

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2017 年 2 月 6 日喜马拉雅西北部 Rudraprayag 地震震源表征及情景地震的地震动预测 (Mw 6.8)

我们研究了 2017 年 2 月 6 日发生在喜马拉雅西北部北阿坎德邦 Rudraprayag 的中度地震，该地震不仅在震中地区周围而且在德里国家首都辖区 (NCT) 的不同地区产生了明显的地面震动。是一次不寻常的经历。全波形反演和震源研究表明，该事件的矩震级为 Mw 5.5，质心深度为 19 km。波形分析还揭示了与拆离下倾顶点相关的斜断层机制。震源参数，即震源半径、应力降和地震矩估计分别为 2.3 km、63 bar 和 2.05 E + 17N-M。该事件的震中位于喜马拉雅山脉两个主要逆冲断层之间的地震活跃区，即，主边界推力 (MBT) 和主中央推力 (MCT)。在本研究中，考虑到它类似于 1999 年 3 月 29 日发生的 Chamoli 地震（M 6.8），使用经验格林函数（EGF）方法模拟了同一震源的 Mw6.8 情景地震的强地面运动。发生在附近。已经在记录地点估计了峰值地面加速度（PGA），并为整个研究区域生成了等高线图，覆盖距离源头约 700 公里的城市。预测的强地面运动在震中区域内高达约 150 公里的范围内在 22 加仑到 352 加仑之间变化，这可能导致中度至严重的地面震动。然而，在研究区域的其余部分预计会有微弱到轻微的震动，PGA 范围在 (0.50-22) 加仑之间。