Mass movement-induced tsunamis: main effects during the Patagonian Fjordland seismic crisis in Ais谷n (45～25%26apos;S), Chile

作者：Naranjo; Jose Antonio; Arenas; Manuel; Clavero; Jorge; Muoz; Oscar

来源：Andean Geology, 2009.

• tsunami
• mass movements
• seismic crisis
• land use planning
• patagonian fjordland
• fiordo aisen.

the epicentre of the long-lasting seismic crisis started on the evening of january 22,2007 and it was located 20 km to the west of puerto chacabuco in the patagonian fjordland, chile (45～25%26apos;s). approximately 7,000 events were recorded up to early may, four of which reached magnitudes greater than 5 (richter), with local intensities up to vii in puerto chacabuco and puerto ais谷n and vi in coihaique. the seismic swarm was located within the liquiˋe-ofqui fault zone (lofz), which controls the emplacement of several monogenetic volcanic cones and larger stratovolcanoes. the january 23 (ms 5,2) and april 1 (ms 5,4) events caused minor damages in salm車n industry installations near the epicentral zone, however the earthquake that oceurred at 13:54 hours (local time) on april 21 (mw 6,2) triggered various mass movements on the fiordo ais谷n slopes and generated tsunamis. debris flows and tsunami waves caused the death of three people and the disappearance of seven, in addition to severe damages to the salm車n industry installations. a similar phenomenon had oceurred in 1927, but then fewer people inhabited the 芍rea. initially, confusi車n dominated the scientific coordination of the emergeney management due to seismic data misinterpretation.