Earthquake swarms reveal submarine magma unrest induced by distant mega-earthquakes: Andaman Sea region

0450958 - GFÚ 2017 RIV NL eng J - Journal Article
Špičák, Aleš - Vaněk, Jiří
Earthquake swarms reveal submarine magma unrest induced by distant mega-earthquakes: Andaman Sea region.
Journal of Asian Earth Sciences. Roč. 116, February (2016), s. 155-163. ISSN 1367-9120. E-ISSN 1878-5786
Institutional support: RVO:67985530
Keywords : earthquake swarms * magma migration * submarine volcanic arc
Subject RIV: DC - Siesmology, Volcanology, Earth Structure
Impact factor: 2.335, year: 2016

Little is known about earthquake-triggered magma intrusions or eruptions of submarine volcanoes. The analysis of teleseismic earthquake occurrence performed in this study offers a tool to address such enigmatic and inaccessible processes. In the past ten years, the Andaman Sea region repeatedly became a site of shallow earthquake swarms that followed distant mega-earthquakes by days to weeks. The MW 9.1 December 26, 2004 Sumatra-Andaman earthquake was followed by two earthquake swarms about 600 km northward in the Andaman Sea region, delayed by 30 and 35 days, respectively. Earthquakes of one of these seismic episodes, the extensive January 2005 earthquake swarm, migrated laterally at a rate of about 0.25 km per hour during the swarm evolution. The strong Indian Ocean MW 8.6 and 8.2 April 11, 2012 earthquake doublet west of Northern Sumatra was followed by an earthquake swarm approximately 800 km northward in the Andaman Sea region, delayed by 13 days.
Permanent Link: http://hdl.handle.net/11104/0252342