Hydrophone monitoring of microseismic activity on the Southern Kuril Islands in 2011-2012

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   The results of the natural hydroacoustic observation of microearthquakes
   on the Southern Kuril Islands using autonomous hydrophone seismostations
   are presented. Hydrophone stations were mounted on the Kunashir, Shikotan
   and Urup Islands. Analysis of the hydroacoustic records showed that
   microseismic activity become apparent on the Kunashir and Shikotan in 2011
   and 2012 as opposed to 2007-2010 and more than ten local microearthquakes
   were registered during the observation period. Characteristic features of
   these local microearthquakes are the relatively high peak amplitude of
   P-waves and close values of time difference between of P- and S-waves
   appearance. Microearthquakes were accompanied with appreciable generation
   of Raleigh waves. Some of the microearthquakes were registered
   simultaneously by two hydrophone stations mounted on the east and west
   coasts of the Shikotan Island (the distance between stations was 3 km).
   The estimated magnitudes of registered microearthquakes are in range ML=
   0-1.82.