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      Permanent link:
      https://www.ias.ac.in/article/fulltext/jess/130/0029

    • Keywords

       

      Earthquake swarm; perceptible earthquake sequence; monsoon-induced earthquakes; failed rift region.

    • Abstract

       

      Sadrabadi and Zilphi villages of Dharni Taluka in Amravati district, Maharashtra, experienced small magnitude earthquakes between September 1, 2018 and December 9, 2018. We deployed a four station temporary network of three component broadband seismographs to understand and characterize the earthquake sequence. We find that the short lived (${\sim}$2 months) micro-earthquake (M $\leq$2.4) swarm, accompanying rumbling sound, was highly clustered (3$\times$3 km$^{2}$) and occurred at extremely shallow depth (<0.4 km). Analysis of the data reveal that the earthquake swarm might have been induced by the percolation of monsoonal rainwaters (reaching (${\sim}$100 mm/day) through the cracked volume of soil/rock, associated with the fault system of the Narmada Son failed rift region. Besides revealing the science of earthquake swarm and characterizing it, the monitoring of earthquake swarm and its analysis contributed significantly in reducing the public panic.

      $\bf{Highlights}$

      $\bullet$ We report a case of monsoonal rainfall induced earthquakes from the Narmada Son failed rift region in Amravati district.

      $\bullet$ The earthquake sequence is referred here as an earthquake swarm.

      $\bullet$ The near surface shallow focused micro earthquakes (M$\leq$2.4) occurred in a small region (3$\times$3 km$^{2}$) immediately after the monsoon of 2018.

      $\bullet$ Monitoring of such sequence is important to declare whether the sequence is a swarm activity that may not lead to the occurrence of a strong earthquake in the region.

    • Author Affiliations

       

      MONIKA WADHAWAN1 NARESH RANA1 2 VINEET GAHALAUT1 3 MANJEET SINGH1 KULBIR SINGH1 SURESH G1 MISHRA O P1 AKSHAY KUMAR JOSHI4 A V KULKARNI4 MAHENDRA SINGH4 A K DAS5

      1. National Center for Seismology, New Delhi, India.
      2. Department of Rural Technology, HNB Garhwal University, Srinagar 246 174, India.
      3. CSIR-National Geophysical Research Institute, Hyderabad, India.
      4. Geological Survey of India, Central Region, Nagpur, India.
      5. India Meteorological Department, New Delhi, India.

    • Dates

       
      Published
      5 February 2021
      Manuscript received
      29 June 2020
      Manuscript revised
      20 August 2020
      Accepted
      27 September 2020
      Final version published online
      5 February 2021

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