Maharashtra Reports Earthquake Swarm

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Maharashtra Reports Earthquake Swarm

Environment
Maharashtra Reports Earthquake Swarm

Maharashtra reports a spate of small earthquakes that seismologists describe as an earthquake swarm. The news highlights the defining features of earthquake swarms and a hydro-seismic cause linked to monsoon rainfall in Deccan basalt fractures.

Earthquake Swarm :

Dimension Key Details
Definition Occurs when multiple seismic events of comparable intensity strike a small area in relatively quick succession.
Key features Comprises a series of many, sometimes thousands, low-intensity shallow earthquakes at <10 km depth, without a discernible main shock.
Duration and setting Can occur over weeks in active geothermal areas.
Hydro-seismic cause Monsoon rainfall seeps into Deccan basalt fractures, building pore-fluid pressure that weakens fault resistance and triggers repeated, low-intensity energy.
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Q 1 / 2

With reference to earthquake swarms, consider the following statements:

1. They can include a series of many, sometimes thousands, of low-intensity earthquakes.

2. They are described as occurring without a discernible main shock.

Which of the statements given above are correct?