UPSC PSC SSC EXAMS Geography of Rajasthan,RAS Mains,RAS Mains Test Series,RAS Prelims Seismic Zones and faults: Earthquake Hazard in Rajasthan

Seismic Zones and faults: Earthquake Hazard in Rajasthan

Seismic Zones & Earthquake Hazard in Rajasthan

Earthquake History

  • Though the state of Rajasthan has not had a major earthquake in recent years, small to moderate earthquake have been felt in the state.
  • Several faults have been identified in this region out of which many show evidence of movement during the Holocene epoch.
  • The Cambay Graben terminates in the south-western part of the state. The Konoi Fault near Jaisalmer trends in a north-south direction and was associated with the 1991 Jaisalmer earthquake. Several active faults criss-cross the Aravalli range and lie parallel to each other.
  • The most prominent of them is the north-south trending Sardar Shahr Fault and the Great Boundary Fault which runs along the Chambal River and then continues in the same direction into Uttar Pradesh.
  • However, it must be stated that proximity to faults does not necessarily translate into a higher hazard as compared to areas located further away, as damage from earthquakes depends on numerous factors such as subsurface geology as well as adherence to the building codes.

According to GSHAP data, the state of Rajasthan falls in a region of moderate to high seismic hazard. As per the 2002 Bureau of Indian Standards (BIS) map, Rajasthan falls in Zones II, III & IV. Historically, parts of this state have experienced seismic activity in the M 5.0 range.

Largest Instrumented Earthquake in Rajasthan

  1. 15 August 1906 – Thar Desert, Rajasthan, Mw 6.2
  2. This event was located along the India-Pakistan border, in the vicinity of Janpalia, Rajasthan which is located north-northwest of Bakhasar.

Seismic Faults in Rajasthan

  • Several faults have been identified in Rajasthan, out of which many show evidence of movement during the Holocene epoch.  
  • The Cambay Graben terminates in the south-western part of the state.
  • The Konoi Fault near Jaisalmer trends in a north-south direction and was associated with the 1991 Jaisalmer earthquake.
  • Several active faults criss-cross the Aravalli range and lie parallel to each other.
  • The most prominent of them is the north-south trending Sardar Shahar Fault and the Great Boundary Fault which runs along the Chambal River and then continues in the same direction into Uttar Pradesh.
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