Two reports describe how sedimentary basins can amplify shaking from distant earthquakes. Sedimentary basins are depressions in Earth’s crust, often relatively flat, and they are frequently chosen for building cities because the terrain is convenient and extensive. The research explains that during earthquakes, seismic energy can become trapped within these basin-shaped structures. Rather than dissipating, the trapped waves can build up and increase ground motion as they reverberate, effectively turning the basin into a natural “resonance chamber.” As a result, cities located above the basin can experience stronger shaking than locations outside the basin when an earthquake occurs at a distance. The combined accounts emphasize the basin’s geometry and the way seismic waves interact with sediment-filled structures. While earthquakes and their direct sources vary, the key shared point is that basin resonance can make distant shaking more destructive for communities built on these geological features.
Study explains why earthquakes can damage cities on sedimentary basins from far away
Two reports describe how sedimentary basins can amplify shaking from distant earthquakes. Sedimentary basins are depressions in Earth’s crust, often relatively flat, and they are frequently chosen for...
- Sedimentary basins are crustal depressions and are often relatively flat, making them common sites for cities.
- During earthquakes, seismic waves can become trapped within sedimentary basins.
- Basin trapping can cause reverberation that amplifies ground motion.
- The effect can make cities on basins more vulnerable to distant earthquakes.
- The reported explanation is based on how wave behavior and basin geometry interact during seismic events.
Sedimentary basins—depressions in Earth's crust caused by tectonic activity—tend to be flat and are favored places to build cities. But during earthquakes, they can become natural resonance chambers.
5 hours agoFlat basins are favoured places to build cities. But seismic waves can get trapped in these basins, putting cities at risk from distant earthquakes.
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