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首页> 外文期刊>Journal of Asian earth sciences >Coda wave seismic structure beneath the Indian Ocean region and its implications to seismotectonics and structural heterogeneity
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Coda wave seismic structure beneath the Indian Ocean region and its implications to seismotectonics and structural heterogeneity

机译：印度洋地区下的尾波地震构造及其对地震构造和构造异质性的影响

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摘要

The Indian Ocean region is one of the challenging areas for seismological research because of its complex seismotectonic settings and intricate structural heterogeneity prevails beneath the Indian Ocean region. In order to address the problem we attempted to determine the attenuation structure for the Indian Ocean region using coda wave generation by single backscattering model. In this study, the central frequency of interest has been considered between 1.5 and 12.0 Hz with lapse time window (LTW) of 20, 30, 40, 50 and 60 s measured from the origin time of the earthquake. We obtained the attenuation relation for different seismotectonic zones associated with varying estimate of attenuation parameters; Spreading Zone [Q(c(SPZ)) = 171f(1.10)]; Subduction Zone [Q(c(SZ)) = 220f(0.961)]; Triple Point Junction [Q(c(TPJ)) = 156f (1.)(15)]; Prominent faults of Indian Ocean region [Q(c(PFIOZ)) = 197f(3.)(99)] and Volcanic and Hotspot [Q(c(VZ,HS)) = 209f(0.97)]. We estimated average frequency-dependent attenuation parameters of Qo that varies as 156 +/- 32 <= Q(o) <= 220 +/- 33 with corresponding variability in frequency parameter (theta) as 0.96 +/- 0.05 s theta s 1.15 +/- 0.09 at 40 s LTW for the entire Indian Ocean region, suggesting that the entire Indian Ocean is seismo-tectonically highly active and is attributed to the nature and extent of attenuation due to varying amount of structural heterogeneity in different tectonic zones characterized by the occurrence of earthquakes of varying strengths in the seismically active tectonic zones of the region. We found that the triple Junction (RTJ) is associated with low-Q e and high attenuation because of deposition of a variety of sediments at the RTJ, which is in unison to the geological mapping of the region. We observed that our estimated attenuation model is comparable that of the Aleutian Islands (the Adak Seismic zone) at low frequency (<= 5 Hz) and to the Philippine Sea Subduction zone (Petukhin) at higher frequency range (>= 5 Hz), which is very much correlative to seismo-tectonic settings. We infer that our assimilated attenuation model has potential to provide information on intricate seismotectonics and seismogenesis for computing earthquake source parameters, and earthquake hazards that may be useful for assimilating detailed seismic velocity structure beneath the Indian Ocean region.
机译：印度洋地区是地震学研究中最具挑战性的地区之一，因为其复杂的地震构造环境和复杂的结构异质性普遍存在于印度洋地区之下。为了解决这个问题，我们试图通过单个反向散射模型利用尾波产生来确定印度洋地区的衰减结构。在这项研究中，考虑的目标中心频率在1.5到12.0 Hz之间，从地震发生时间开始测量的经过时间窗（LTW）为20、30、40、50和60 s。我们获得了与地震参数变化估计有关的不同地震构造带的衰减关系。扩展区[Q（c（SPZ））= 171f（1.10）]；俯冲带[Q（c（SZ））= 220f（0.961）];三点连接点[Q（c（TPJ））= 156f（1。）（15）];印度洋地区的突出断层[Q（c（PFIOZ））= 197f（3。）（99）]以及火山和热点[Q（c（VZ，HS））= 209f（0.97）]。我们估计了Qo的平均随频率变化的衰减参数，其变化为156 +/- 32 <= Q（o）<= 220 +/- 33，频率参数（theta）的相应变化为0.96 +/- 0.05 s the s 1.15整个印度洋地区在40 s LTW时为+/- 0.09，这表明整个印度洋具有地震构造上的高度活跃性，这归因于衰减的性质和程度，这是由于不同构造带中结构异质性的数量不同而造成的，其特征是在该地区地震活跃的构造带中发生强度不同的地震。我们发现三重连接点（RTJ）与低Q e和高衰减相关，这是因为RTJ上沉积了多种沉积物，这与该地区的地质图一致。我们观察到，我们估计的衰减模型与低频（<= 5 Hz）的阿留申群岛（Adak地震带）和较高频率范围（> = 5 Hz）的菲律宾海俯冲带（Petukhin）相当，这与地震构造环境非常相关。我们推断，我们的同化衰减模型有可能为复杂的地震构造学和地震发生提供信息，以计算地震震源参数，而地震危险性可能对同化印度洋地区下方的详细地震速度结构很有用。

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