Earthquake Accompanied by Mudflow Observed by a Cabled Observatory off Hatsushima Island in Sagami Bay in April 2006

Author

Iwase, Ryoichi ; Goto, Tadanori ; Kikuchi, Toshiaki ; Mizutani, Koichi

Author_Institution

Japan Agency for Marine-Earth Sci. & Technol. (JAMSTEC), Yokosuka

fYear

2007

fDate

17-20 April 2007

Firstpage

472

Lastpage

475

Abstract

Mudflow associated with an earthquake of magnitude 5.5 was detected with a cabled observatory on deep seafloor off Hatsushima Island in Sagami Bay in April 2006. Environmental fluctuations associated with the mudflow were observed. Water current 12m above the seafloor observed by ADCP was 27 cm/s at maximum and several millimeter sedimentation was recognized by video images. The fluctuation of electric potential difference between submarine cable ends indicates motional induction caused by the mudflow on the slope west of the observatory.

Keywords

earthquakes; image sensors; oceanography; seafloor phenomena; sediments; underwater vehicles; AD 2006 04 21; Acoustic Doppler Current Profiler; Hatsushima Island; Sagami Bay; cabled observatory; earthquake; electric potential difference; environmental fluctuations; mudflow observation; ocean water current; seafloor; sedimentation; submarine cable; video images; Cameras; Earthquakes; Electric potential; Fluctuations; Observatories; Sea floor; Sonar equipment; Temperature sensors; Underwater cables; Video recording;

fLanguage

English

Publisher

ieee

Conference_Titel

Underwater Technology and Workshop on Scientific Use of Submarine Cables and Related Technologies, 2007. Symposium on

Conference_Location

Tokyo

Print_ISBN

1-4244-1207-2

Electronic_ISBN

1-4244-1208-0

Type

conf

DOI

10.1109/UT.2007.370765

Filename

4231095