Paper: GS – I, Subject: Geography, Topic: Geo-physical Phenomenon, Issue: Venezuela Earthquakes and the Rare Seismic Doublet.
Context:
Recently, two powerful earthquakes of magnitude 7.2 and 7.5 struck west of Caracas, the capital of Venezuela, within just 39 seconds. The stronger quake occurred at a shallow depth of about 10 km and caused severe destruction. The sequence was described as a rare seismic doublet.
Key Takeaways:
Explanation:
Why Venezuela Is Earthquake-Prone?
- Venezuela lies near the boundary between the Caribbean Plate and the South American Plate.
- These plates mainly slide horizontally past each other along a strike-slip fault.
- Northern Venezuela therefore has high seismicity and experiences frequent earthquakes.
What Happened:
- The magnitude 7.2 earthquake was classified as a foreshock, which is a smaller quake occurring before a larger one.
- Just 39 seconds later, the magnitude 7.5 mainshock, or the largest event in the sequence, occurred.
- Since both quakes were close in magnitude, location and time, they formed a seismic doublet.
Why the Damage Was Severe?
- The shallow depth allowed strong seismic waves to reach the surface.
- The first quake weakened buildings before the second major shock arrived.
- The doublet prolonged ground shaking and increased building collapse.
- Closely timed major shocks also made rescue operations more difficult and dangerous.
Conclusion:
The disaster resulted from Venezuela’s plate-boundary location, shallow strike-slip faulting and a rare seismic doublet. Strong building codes, monitoring and disaster preparedness are essential in earthquake-prone regions.
Source: (The Indian Express)
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