Scholarlink

<p>In recent years, the Kopili fault reported an increase in seismic activity. Coda-wave attenuation and its frequency dependency can be used to examine the seismo-tectonics. Here, we document the regional heterogeneity in the coda attenuation. Present data in this region report Q<sub>0</sub> (value of Q<sub>C</sub> at 1&#xa0;Hz) variation from 63 (for 30&#xa0;s window) to 213 (for 90&#xa0;s window) and n from 1.330 (for 30&#xa0;s window) to 0.913 (for 90&#xa0;s window). These significant fluctuations in the attenuation parameter (Q<sub>0</sub>) and frequency parameter (n), indicate a velocity inconsistency at depths of 230-270&#xa0;km. This anomaly may be associated with the anisotropy originates in the asthenosphere-lithosphere transition or asthenospheric mantle at depths of 160-320&#xa0;km. Accordingly, this concise work comprehensively analyzes reported implications, supported by observational evidences.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Spatial coda Q fluctuation as a probe for heterogeneous media of Kopili fault zone, Northeast region, India

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年2月16日

查看全文
  • Nilutpal Bora,
  • Rajib Biswas

摘要

In recent years, the Kopili fault reported an increase in seismic activity. Coda-wave attenuation and its frequency dependency can be used to examine the seismo-tectonics. Here, we document the regional heterogeneity in the coda attenuation. Present data in this region report Q0 (value of QC at 1 Hz) variation from 63 (for 30 s window) to 213 (for 90 s window) and n from 1.330 (for 30 s window) to 0.913 (for 90 s window). These significant fluctuations in the attenuation parameter (Q0) and frequency parameter (n), indicate a velocity inconsistency at depths of 230-270 km. This anomaly may be associated with the anisotropy originates in the asthenosphere-lithosphere transition or asthenospheric mantle at depths of 160-320 km. Accordingly, this concise work comprehensively analyzes reported implications, supported by observational evidences.