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2021 Arkalochori Earthquake
A moment magnitude 6.0 earthquake struck the island of Crete in Greece at a depth of 6 km on 27 September 2021. The epicenter of the earthquake was located southeast of Heraklion. The quake killed one person, injured 36 (one indirect) and damaged over 5,000 old buildings on the island. Tectonic setting This region in the Mediterranean is part of the Hellenic arc and is known for its frequent and violent seismic activity and is home to Europe's deadliest earthquakes. The island of Crete in particular lies above a convergent boundary where the Aegean Sea and African plates meet, specifically the African Plate subducting beneath the Aegean Sea. The process of subduction along the Hellenic subduction zone makes the region prone to large earthquakes and tsunamis. The ~ 8.0–8.5 earthquake in Crete in 365 AD and 1303 are examples of subduction zone events. In 1810 and 1856, Crete was struck by large intermediate-depth intraplate earthquakes which were devastating and felt strongl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Peak Ground Acceleration
Peak ground acceleration (PGA) is equal to the maximum ground acceleration that occurred during earthquake shaking at a location. PGA is equal to the amplitude of the largest absolute acceleration recorded on an wikt:accelerogram, accelerogram at a site during a particular earthquake. Earthquake shaking generally occurs in all three directions. Therefore, PGA is often split into the horizontal and vertical components. Horizontal PGAs are generally larger than those in the vertical direction but this is not always true, especially close to large earthquakes. PGA is an important parameter (also known as an intensity measure) for earthquake engineering, The design basis earthquake ground motion (DBEGM) is often defined in terms of PGA. Unlike the Richter magnitude scale, Richter and Moment magnitude scale, moment magnitude scales, it is not a measure of the total seismic scales#Magnitude and intensity, energy (magnitude, or size) of an earthquake, but rather of how hard the earth shake ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
