Surface rupture associated with the 2014 Naganoken-hokubu earthquake (Kamishiro fault earthquake), central Japan

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  • 糸魚川－静岡構造線北部に出現した2014年長野県北部の地震（神城断層地震）の 地表地震断層
  • イトイガワ-シズオカ コウゾウセン ホクブ ニ シュツゲン シタ 2014ネン ナガノケン ホクブ ノ ジシン(シンジョウ ダンソウ ジシン)ノ チヒョウ ジシン ダンソウ

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Abstract

<p>The 2014 M 6.7 Naganoken-hokubu earthquake was caused by movement of the Kamishiro fault located in the northernmost part of the Itoigawa-Shizuoka Tectonic Line (ISTL) active fault system, central Japan. We conducted a series of field research immediately after the earthquake to describe coseismic surface ruptures. Our description methods were: 1) field reconnaissance using pre- and post-earthquake airphotos; 2) quick measurement using staff; 3) topographic profiling using Auto Level and Total Station; and, 4) UAV and highpole SfM measurement. We identified 9-km-long coseismic surface rupture, most of which was located along the pre-existing surface trace of the Kamishiro fault. The maximum value of coseismic vertical offset was ca. 1 m or more, which was recorded at Oide in the northern part of the rupture. Based on comparison of the 2014 coseismic slip distribution with the long-term slip rate distribution, both 2014 slip amount and cumulative offset amounts of L2 and L3 terrace surfaces are larger in the northern end of the ruptures. This implies that the subsurface coseismic slip during pre-2014 earthquakes continued toward the north, similar to that during the 2014 earthquake. In addition, both coseismic slip and long-term slip rate becomes smaller toward the south, indicating that the Kamishiro area is one of the segment boundaries in the northern part of the ISTL active fault system. Further investigations of the 2014 earthquake and the Kamishiro fault are needed to understand formation of tectonic landforms, landscape development, or earthquake prediction model of active faults.</p>

Journal

  • Active Fault Research

    Active Fault Research 2015 (43), 149-162, 2015

    Japanese Society for Active Fault Studies

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