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The IMS Infrasound Network: detection of a large variety of events, including volcanic eruptions. Dr. Paola Campus, Comprehensive Nuclear-Test-Ban Treaty Organization (CTBTO) IMS, Installation and Certification Group, Acoustic Monitoring Project e-mail: Paola.Campus@ctbto.org.
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The IMS Infrasound Network: detection of a large variety of events, including volcanic eruptions Dr. Paola Campus, Comprehensive Nuclear-Test-Ban Treaty Organization (CTBTO) IMS, Installation and Certification Group, Acoustic Monitoring Project e-mail: Paola.Campus@ctbto.org ITW2007: P. Campus Tokyo, 13-16 November 2007
Examples of infrasound signals
The International Monitoring System (IMS) Infrasound Network
Earthquakes Irian Jaya, 2002/10/10, Mw=7.5IS07, Warramunga, NT, Australia: ~2000km
Earthquakes Infrasound might help complement the information about earthquakes especially when, for local events, local seismic networks are very sparse or non existing
Bolides Chicago fireball, 2003/03/27
Chicago fireball • A few minutes after midnight (local time) on March 27, 2003, a huge bolide entered the atmosphere, moving across Ohio, Illinois, Indiana and Wisconsin and producing a luminous blue flash. • Fragments of the bolide hit an inhabited area of about 10 km, located south of Chicago.
Chicago fireball, IS10, Lac du Bonnet, Canada: ~1170km • Two different bolides following two different trajectories?
Movements of glaciers and calving of icebergs IS18, Qaanaaq, Northern Greenland, Danemark
IS18: long duration infrasound signal freq. 0.4-6 Hz • Slow movement of glacier or tide associated to it?
Movements of glaciers and calving of icebergs Infrasound might help monitor the effects of global warming through the systematic observation of movements of glaciers and calving of icebergs
Volcanic hazard: a serious threat to -Nearby settlements -Civil Aviation The IMS Infrasound Network can contribute to volcano monitoring
The increased number of IMS Infrasound Stations allows us to monitor several active volcanic areas around the world
Volcanoes AUGUSTINE Alaska, Aleutian Islands, Kamishak Bay, Southern Cook Inlet 59.363N, 153.43W; summit elev. 1,252 m Augustine is the most active volcano of the eastern Aleutian arc. On January 13, 2006 the volcano entered a period of repetitive and explosive eruptions. Each event produced ash plumes, mudflows, and pyroclastic flows
IS53: Dist. ~ 675 km; Prop.Time ~00:37Frequency band: 0.4-8 Hz
IS53: Dist. ~ 675 km; Prop.Time ~00:37Frequency band: 0.4-8 Hz
Volcanoes KARYMSKY Kamtchatka Peninsula, Russian Federation 54.05°N, 159.43°E; summit elev. 1,536 m Karymsky is the most active volcano of the eastern volcanic zone of Kamtchatka. Growth of the lava dome since the end of 2005. Several ash explosions on the beginning of 2006. First example: ash plumes registered on 2006/01/12. No origin time was available
Volcanoes KARYMSKY Two events close in time, with no significant variation in the meteorological conditions (wind speed, wind direction, temperature): the difference in the waveforms can be associated to differences in the source
Volcanoes KARYMSKY From 07 May to 14 May the seismicity was above background levels, with 330-450 shallow earthquakes per day. Based on seismic data, possible ash and gas explosions. No origin time was available