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    • MAHENDRA SINGH

      Articles written in Journal of Earth System Science

    • Volume 130 All articles Published: 5 February 2021 Article ID 0029 Brief Communication

      Monsoonal rainfall induced shallow earthquake Swarm in the Amravati district of the central India

      MONIKA WADHAWAN NARESH RANA VINEET GAHALAUT MANJEET SINGH KULBIR SINGH SURESH G MISHRA O P AKSHAY KUMAR JOSHI A V KULKARNI MAHENDRA SINGH A K DAS

      More Details Abstract Fulltext PDF

      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.

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