Fracture Geometry Feature of the Northwest-Pacific Subduction Zones
GUO Yu-fan
GONG Wei
LUO Jia-hong
TAN Lan-rong
DONG Fei-fei
ZHA Xiao-hui
Abstract：Based on P-wave travel time of seismic data ,processed using the double difference tomography method ,the hypocenter relocation results and P-wave velocity structure within the range of 0~70 km be-neath the Pacific ocean subduction zones can be obtained .Combining with the bathymetric data and frac-ture feature data ,we obtained the fracture geometry feature within the range of 0~70 km beneath the Northwest of the Pacific Ocean subduction zones and identified the fracture classification of Northwest-Pa-cific subduction zones .1-level fractures include Itoigawa-Shizuoka Tectonic Line (ISTL ) ,Tartary Fault (TF) ,Tartary-Tanakura Fault (TTF) ,Tartary-Ishikari Fault (TIF) ,East Japan Sea Fault (EJSF) ,Cen-tre Hokkaido Sakhalin Fault (CHSF ) , Abashiri Fault (AF ) , the South of the Kuril Basin Boundary (KBB2) ,the West of Okhotsk Fault (WOF) ,the East of Okhotsk Fault (EOF) .2-level fractures include Median Tectonic Line (MTL) ,Hatagawa Tectonic Line (HTL) ,the North and the South of the Japan Ba-sin Boundary (JBB1 ,JBB2) ,Hokkaido Faults(R8-fault ,R9-fault ,R10-fault ,R11-fault ,R12-fault ,R13-fault) ,the North of the Kuril Basin Boundary (KBB1) ,East Sakhalin Fault (ESF) ,Okhotsk Faults(S1-fault ,S2 ,S3)、Kamchatka Faults (Ka1-fault ,Ka2-fault ,Ka3-fault ,Ka4-fault) .The number of 3-level and above level fractures is large ,such as R1~R7 faults ,R14~R25 faults w hich are reverse faults and N1~N4 faults w hich are normal faults .
Keywords：the Japan trenchthe Kuril-Kamchatka trenchseismic tomographyfracture geometry fea-turesfracture classification
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：10( 1-10 )