Presented at the CTBT Science and Technology 2013 Conference, Hofburg, Vienna, June 17-21.
Link to presentation: Mikhail Rozhkov, Ivan Kitov, and Dmitry Bobrov
Abstract
Two
events crucial for monitoring of nuclear explosions under the CTBT occurred on
February 12 and 15 and attracted attention of the mass media and scientists. Seismic
waves from the underground event and infrasound waves from the meteorite are of
extreme interest as well as various processes of energy conversion at the free
surface. Infrasound station I45(RU) collocated with seismic array USRK recorded
the epicentral I-phase generated by the DPRK 2013 event and the seismoacoustic
wave emitted beneath the station. The shock wave from the Chebarkul meteorite
generated a regular I-phase recorded by many IMS infrasound stations and a
series of seismic phases likely associated with impact and acoustoseismic
conversion. Due to the altitude of the peak energy release, the air-coupled
ground rolls with a group velocity of 3.5 km/s were generated. A similar
pattern was observed after the 1984 r.Chulym (Siberia) bolide. We estimate the
energy of both sources and discuss possible mechanisms of acoustic/seismic wave
generation and conversion.
Key
words: CTBT, data fusion, IMS, meteorite, DPRK 2013
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