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      Permanent link:
      https://www.ias.ac.in/article/fulltext/jess/130/0052

    • Keywords

       

      Seismicity; focal mechanism; Cuddapah basin; HypoDD.

    • Abstract

       

      On January 26, 2020, a moderate-sized earthquake ($M_{L}$ ${\sim}$ 4.6) located in the Palnadu sub-basin of Cuddapah basin was felt both in the states of Telangana and Andhra Pradesh. The earthquakes prior and after the $M_{L}$ 4.6 are located close to the thrust and along the periphery of the backwaters of the Pulichintala Reservoir. About 965 earthquakes in the magnitude range of 0.1–4.6 $M_{L}$ have been located by seismological network. The epicentral parameters obtained from double difference technique illuminated a steep seismogenic structure extending up to 8 km depth using a minimum 1-D velocity model. The b-value estimate is 0.82 for a completeness magnitude of $M_{c}$ 1.8 and could be associated with the intraplate event having a longer recurrence time. The focal mechanism solution obtained from waveform inversion reveals a pure double-couple mechanism of a strike-slip motion with a reverse component on a N–S trending focal plane. The spatial distribution of the earthquake sequence and fault plane solution of the main event are close to a thrust which is the most likely source region of the main-shock.

      $\bf{Highlights}$

      $\bullet$ Relocation of the Palnadu earthquake sequence illuminated a steep seismogenic structure extending up to 8 km depth.

      $\bullet$ The estimated lower b-value (0.82) could be associated with the intraplate event having a longer recurrence time.

      $\bullet$ The focal mechanism solution of the main-shock ($M_{L}$ 4.6) shows a strike-slip motion with a reverse component.

    • Author Affiliations

       

      SRINAGESH D1 SUNILKUMAR T C1 NARESH B1 VITTHAL S1 DHIRAJ K SINGH1 RAVI P SINGH1 MAHALAXMI NAIDU1 G SURESH1 P SOLOMON RAJU1 V PAVAN KUMAR1 PRANTIK MANDAL1 A N S SARMA1

      1. CSIR-National Geophysical Research Institute, Uppal Road, Hyderabad 500 007, India.

    • Dates

       
      Published
      10 March 2021
      Manuscript received
      10 June 2020
      Manuscript revised
      2 September 2020
      Accepted
      25 November 2020
      Final version published online
      10 March 2021

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