kg kg km Wide-angle OBS survey in the Kuril Trench, the eastern Hokkaido - KY0005 cruise report - Ayako NAKANISHI Seiichi MIURA Koichiro OBANA Shuichi
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1 kg kgkm Wide-angle OBS survey in the Kuril Trench, the eastern Hokkaido - KY0005 cruise report - Ayako NAKANISHI Seiichi MIURA Koichiro OBANA Shuichi KODAIRA Yoshiyuki KANEDA Narumi TAKAHASHI In July - August of, we performed a deep crustal survey in the Kuril Trench, the eastern Hokkaido using forty-five ocean bottom seismographs and a L airgun array of R/V KAIYO. It is known that historic great earthquakes recurred along the Kuril trench with remarkable spatial regularities. These large thrust earthquakes are attributed to the subduction of the Pacific plate beneath the overriding plate. Moreover, large intraplate earthquakes occurred in recent years. To understand the relationship between the generation of these large earthquakes and deep crustal structure, we aimed to obtain structure of seismogenic zone in the Kuril Trench. An ocean-land seismic profile was selected to across the eastern Hokkaido from the trench axis the North Pacific Ocean to the sea of Okhotsk northwestward. Three explosions with a kg and two kg charges were also recorded by ocean bottom seismographs during the survey. Processed data shows that both airguns shots and explosions were recorded with good quality over a km length profile. Keywords : airgun, ocean bottom seismograph, Kuril Trench, eastern Hokkaido, crustal structure Frontier Research Program for Subduction Dynamics Deep Sea Research Department
2 M=. Mw=. 46 Kuril Basin HK101-O Sea of Okhotsk F 44 J1 HK100 J2 E J3 Kushiro Canyon C Kuril Trench D 42 B HK101-P North Pacific Ocean 40 A km Depth (m) A F OBS Fig. Map around the Kuril Trench, the eastern Hokkaido Red rectangles indicate coseismic rupture zones estimated by fault parameters of each great earthquake occurred between and. Broken lines indicate boundaries between rupture zones of A - F. Thick line denotes seismic profile. Open circles indicate OBS positions. Yellow stars show explosions performed on land.
3 A F B M. A C D E F M - - km 46 HK101-O HK J1 J2 J HK101-P 40 50km Fig Depth (m) KY HK, HK-O, HK-P OBS Location map of KY cruise with earthquake distribution. Hypocenteres are determined by Japan Meteorological Agency from October of to September of. The wide-angle seismic survey was conducted along profiles HK, HK-O, and HK-P. The airgun was shot along the thick line. Labeled yellow circles indicate OBS positions. Red stars show explosions performed on land.
4 - m H O m. km/s. -. km/s. -. km/s.-. s km/s. km/s.-. s- km C KY OBS HK-P HK-O HK,MPa m mgps. m m OBS HK-P. km HK-O km HK km OBS OBS Site OBS OBS. Hz Hzbit A/D DAT HK-O, HK-P OBS, OBS DAT Table Information of seismic profiles Line name HK100 HK101-O HK101-P Start Time (GMT) 00/7/24 20:52: /7/25 08:03: /7/26 00:00: Lat. (North) Lon.(East) END Time (GMT) 00/7/25 04:10: /7/25 23:58: /7/29 20:52: Lat. (North) Lon.(East)
5 Table Information of the deployment and retrieval of OBSs. Site No Deployed position Retrive Determined position Time(GMT) Lat. (North) Lon. (East) Dep. (m) Time(GMT) Lat. (North) Lon. (East) 00/07/20 20:56 00/07/20 21:38 00/07/20 22:21 00/07/20 23:03 00/07/20 23:45 00/07/21 00:29 00/07/21 01:12 00/07/21 01:58 00/07/21 02:42 00/07/21 03:27 00/07/21 05:03 00/07/21 05:44 00/07/21 06:22 00/07/21 06:58 00/07/21 07:36 00/07/17 23:00 00/07/17 23:27 00/07/17 23:55 00/07/18 00:21 00/07/18 00:48 00/07/18 01:14 00/07/18 01:35 00/07/18 01:55 00/07/18 02:15 00/07/18 02:36 00/07/18 02:57 00/07/18 03:19 00/07/18 03:40 00/07/18 04:00 00/07/18 04:19 00/07/18 04:36 00/07/18 04:56 00/07/18 05:14 00/07/18 05:31 00/07/18 05:48 00/07/18 06:06 00/07/18 06:22 00/07/18 06:39 00/07/18 06:55 00/07/18 07:10 00/07/18 07:26 00/07/18 07:42 00/07/18 07:59 00/07/18 08:16 00/07/18 08: /08/06 23:07 00/08/07 01:28 00/08/07 05:22 00/08/07 07:56 00/08/07 22:43 00/08/08 01:49 00/08/08 04:08 00/08/08 06:10 00/08/06 08:02 00/08/06 05:26 00/08/06 00:51 00/08/05 23:26 00/08/05 22:06 00/08/05 20:45 00/08/05 19:27 00/08/02 00:23 00/08/02 02:46 00/08/02 05:44 00/08/02 08:25 00/08/03 00:02 00/08/01 14:22 00/08/01 15:35 00/08/01 17:48 00/07/30 01:01 00/08/01 11:39 00/08/01 12:16 00/07/30 03:12 00/07/30 04:45 00/07/30 06:38 00/07/30 07:35 00/07/30 09:07 00/07/30 10:38 00/08/01 09:42 00/08/01 08:06 00/08/01 06:29 00/08/01 04:53 00/08/01 03:21 00/08/01 01:53 00/08/01 00:01 00/07/31 22:22 00/07/31 18:29 00/07/31 16:30 00/07/31 14:20 00/07/31 11: Dep. (m) Table Information of explosions performed on land explosion Time (GMT) Lat. (North) Lon.(East) Hight above sea level (m) J1 J2 J3 00/7/23 16:02: /7/23 16:32: /7/23 17:02:
6 km km/s s Mw=. USGS OBS m OBS Site, HK HK-O HK-P OBS shot gather HK kmobs site km site km/s OBS km sitekm/s sitekm/s site km/s km/s site km km/s km/s km. km/s phase S HK-O mkmobs site km site HK km/s km HK-O OBS km sitesite km/s site site km/s site km km/s site km/s km km sitesite km HK-Pkm OBS site. km site sitesite. kms/ km/s km/s km/s. km./s site km sitekm km/s.km/s site km/s km/s km/s km/s site sitekm/s OBS site km site km site site km OBS Site site km sitekm sitesite km/s
7 (a) Site 12 (b) Site 12 horizontal 1 (c) Site 12 horizontal 2 (d) Site 12 hydorophone (e) Site 15 HK OBS site - Hz km/s / a site b site c site d site e site Fig. Observed seismograms at OBSs site and on HK have been digitally band-pass filtered to Hz. Reduction velocity is km/s. Trace amplitudes are scaled by the square root of the offset distance. a component recorded at site, b horizontal component recorded at site, c horizontal component recorded at site, d hydrophone data of site, and e component recorded at site. Later phases recognized in the record section of hydrophone are considered as multiples.
8 (a) Site (b) Site (c) Site HK-O OBS site a site b site c site OBS Fig. Observed seismograms at OBSs site,, and on HK-O. Method of digital processing is same as Fig.. a component recorded at site, b component recorded at site, and c recorded at site. Several multiples are recognized because of shallow water.
9 (a) Site (b) Site (c) Site (d) Site (e) Site HK-P OBS site a siteb sitec sited sitee site Fig. Observed seismograms at OBSs site,,,, and on HK-P. Method of digital processing is same as Fig.. a component recorded at site, b component recorded at site, c component recorded at site, d component recorded at site, and e component recorded at site.
10 (a) Site (b) Site (c) Site HK a site b sitec site Fig. Observed seismograms at OBSs site,, and on HK with the long offset distance. All seismograms show component. Method of digital processing is same as Fig.. a airgun shots of North Pacific Ocean recorded at site, b airgun shots of the sea of Okhotsk recorded at site, and c site.
11 (a) J (b) J (c) J J JOBS a J b J c J Fig. Observed seismograms recorded at all OBSs for explosions on land J, J, and J. Method of digital processing is same as Fig.. Huge amplitudes were clipped. a component recorded at all OBSs for J, b J, and c J.
12 km/ssitesite km/skm/s km/s site sitesite OBS site km site sitekm HK-O OBS HK-P site site HK-P HK-O phase s phase kms s sites/n phase site HK-O km phase km s site km/s phase phase s phase km/s km km km km/s kmkm/s.gmt.. km Mw. USGS site site site site km/s KY OBS kmobs OBS OBS J J J km/s km km/skm J J km J site site Fig. Observed seismograms component recorded at site for Sakhalin earthquake Mw=. occurred on / /. True amplitudes were plotted. Huge amplitudes were clipped.
13 KY. Iwasaki T., N. Hirata, T. Kanazawa, T. Urabe, Y. Motoya, and H. Shimamura, "Earthquake distribution in the subduction zone off eastern Hokkaido, Japan, deduced from ocean bottom seismographic and land observations", Geophys. J. Int.,, -,.,, -. Hirata, N., T. Kanazawa, K. Suyehiro, T. Iwasaki, and H. Shimamura, Observation of microseismicity in the Southern Kuril Trench area by arrays of ocean bottom seismometers, Geophys. J. Int.,, -. Shimazaki, K., Nemuro-Oki earthquake of July, : A lithosperic rebound at the upper half of the interface, Phys. Earth planet. Inter.,, -. Shimamoto, T., The origin of large of great thrust-type earthquakes along subducting plate boundaries, Tectonophysics,, -. Den, N., H. Hotta, S. Asano, T. Yoshii, N. Sakajiri, Y. Ichinose, M. Motoyama, K. Kakiichi, A. F. Beresnev, and A. A. Sagalevitch, Seismic refraction and reflection measurements around Hokkaido. Part. Crustal structure of the continental slope off Tokachi, J. Phys. Earth,, -. Asano, S., N. Den, H. Hotta, T. Yoshii, Y. Ichinose, N. Sakajiri, and T. Sasatani, Seismic refraction and reflection measurements around Hokkaido Part. Crustal structure of the continental slope off Hidaka, J. Phys. Earth,, -. Nishizawa, A., and K. Suyehiro, Crustal structure across the Kulile Trench off south-eastern Hokkaido by airgun- OBS profiling, Geophys. J. R. astr. Soc.,, -. Iwasaki, T., H. Shiobara, A. Nishizawa, T. Kanazawa, K. Suyehiro, N. Hirata, T. Urabe, and H. Shimamura, A detailed subduction structure in the Kuril Trench deduced from ocean bottom seismographic refraction studies, Tectonophysics,, -. DAT, -,..
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