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首页> 外文期刊>Pure and Applied Geophysics >One-Dimensional Velocity Model, Station Correction and Earthquake Relocation of Local Earthquakes in the Koyna-Warna Region, India
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One-Dimensional Velocity Model, Station Correction and Earthquake Relocation of Local Earthquakes in the Koyna-Warna Region, India

机译：印度Koyna-Warna地区局部地震的一维速度模型，站校正和地震迁移

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In this paper we investigated the feasibility of using the higher-frequency waveforms to characterize the seismicity in the Koyna-Warna region, globally well-known for its reservoir-triggered earthquakes. The local seismicity and source parameters have been extensively explored by many researchers using various types of data, e.g. analog data, broadband seismological data, and deep seismic sounding data. However, here we have utilized the seismological data recorded by 97 temporary 4.5-Hz geophones to locate the local seismicity in the region. We first investigated an appropriate 1-D P-wave velocity model through the inversion of P- and S-times. In order to compensate for the thick and laterally heterogeneous basalt, we incorporated the station corrections in the 1-D velocity inversion process. The station correction varies from + 0.09 to - 0.20 s for the P-waves, with clear demarcations of positive and negative station corrections corresponding to the northern and southern regions, respectively. The patterns of positive and negative station corrections suggested that the northern part is characterized by lower velocity, while slighter higher velocities present in the southern part of the study area are relative to the estimated 1-D velocity model. The earthquake locations are further improved by using the double-difference (hypoDD) approach, which enabled us to accurately map shallow subsurface seismogenic faults in the region. The data comprises 10,062 P-wave and 9049 S-wave catalog differential times from 348 earthquakes (1.0 <= M-L <= 4.5). The precisely relocated earthquakes (ERH < 0.05 km ERZ < 0.5 km and rms < 0.02 s) form the three clusters of earthquakes in the NW-SE direction along the lineaments close to Warna Reservoir. The observed seismicity trends on the surface could be due to the vertical manifestations of faults or fractures. Their alignments are confirmed by the analysis of focal mechanism which exhibits a predominant normal type of faults with on
机译：在本文中，我们研究了利用高频波形来描述库纳-沃纳地区地震活动的可行性。库纳-沃纳地区因水库引发的地震而闻名全球。许多研究人员利用各种类型的数据，例如模拟数据、宽带地震数据和深地震测深数据，对当地地震活动性和震源参数进行了广泛的探索。然而，在这里，我们利用97个临时4.5赫兹地震检波器记录的地震数据来确定该地区的局部地震活动。我们首先通过P波和S波的反演研究了一个合适的一维P波速度模型。为了补偿厚且横向不均匀的玄武岩，我们在一维速度反演过程中加入了台站校正。P波的台站校正从+0.09秒到-0.20秒不等，分别对应于北部和南部区域的正和负台站校正有明确的界限。正、负台站改正模式表明，研究区北部的速度较低，而研究区南部的速度稍高，与估计的1-D速度模型有关。通过使用双差（hypoDD）方法，地震位置得到进一步改善，这使我们能够准确地绘制该地区浅层地下发震断层图。数据包括来自348次地震（1.0<=M-L<=4.5）的10062次P波和9049次S波目录差分时间。精确重新定位的地震（ERH<0.05 km ERZ<0.5 km，rms<0.02 s）沿靠近Warna水库的线性构造形成了NW-SE方向的三组地震。观测到的地表地震活动趋势可能是由于断层或裂缝的垂直表现。通过对震源机制的分析，证实了它们的排列，该震源机制显示了一种主要的正断层类型，并具有on

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