The role of earthquakes in inducing sediment mass movements in the eastern Korinthiakos Gulf. An example from the February 24–March 4, 1981 activity
1984; Elsevier BV; Volume: 55; Issue: 1-2 Linguagem: Inglês
10.1016/0025-3227(84)90131-2
ISSN1872-6151
AutoresC. Perissoratis, Dimitri Mitropoulos, I Angelopoulos,
Tópico(s)Marine and environmental studies
ResumoKorinthiakos Gulf is a narrow arm of the sea connecting the Ionian and the Aegean Seas through the Rion—Antirion Strait and the Korinth Canal, respectively. The eastern part of Korinthiakos was surveyed by the Marine Geology department of the Institute of Geology and Mineral Exploration of Greece using a 3.5-kHz subbottom profiler. The survey was carried out a short time after intensive earthquake activity which occurred in the area from February 24 to March 4, 1981. During this activity, three major shocks of magnitudes ranging from 6.4 to 6.7 took place. The subbottom profiles reveal a sediment mass which was deposited by submarine slumping in the Alkyonides Basin, which lies at the eastern end of the studied area. The slump is about 10 km long, 1.5 to 2.0 km wide and its areal extent is about 16 km2. The scarp area occurs at a bathymetric depth of about 100 to 250 m in the northeastern part of the basin. The scarp faces are from 10 to 15 m high and have a total areal extent of about 4 km2. The destruction of fishing nets of trawling boats and other evidence indicates that the triggering of the mass flow was effected by the earthquake activity and probably by the first major shock. Scarp areas and scarp faces from which sediment masses have been removed were detected in other shallow and deep sectors of the studied area, indicating that mass transport processes are very common in this area of high seismicity.
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