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Integrated Research for 2007 Niigata-Ken Chuetsu-Oki Earthquake

2007年新泻县中越冲地震综合研究

基本信息

批准号：
19900003
负责人：
IWASAKI Takaya
金额：
--
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
财政年份：
2007
资助国家：
日本
起止时间：
2007 至 2008
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-19900003/
关键词：
Niigata-Ken Chuetsu-Oki Earthquake Inland earthquake Aftershock observation OBS observation Strong motion observation Earthquake disaster Earthquake damage Earthquake fault

项目摘要

2007年7月16日10時13分, 新潟県上中越沖の深さ約17kmを震源とするマグニチュード(M)6.8の地震が発生した. この地震により, 新潟県と長野県で最大震度6強を観測し, 大きな被害をもたらした. 発震機構は北西-南東方向に圧縮軸を持つ逆断層型で, 地殻内の浅い地震である. 今回の地震は, 未知の伏在断層で発生したもので, 震源断層の実態を明らかにするためは, 海陸を通じた地震観測により余震の精密な空間分布等を求める必要がある. 特に, 今回の地震は堆積層に覆われた地域で発生しており, このような地域で余震の分布から震源断層の実態を明らかにすることは, 今後の同様の地域での地震発生を考える上で重要である. そこで, 平成19年度の本調査研究では, 海底地震計及び陸上臨時観測点を合計79台設置し, 余震の精密な空間分布等を求め, 今回の活動で発生した断層の正確な形状等を把握し, 本震の性質の推定等を行なった. その結果, 余震域の南西側は南東傾斜の余震分布が支配的であり, 北東側では北西及び南等傾斜の分布が混在することがわかった. 北東側と南西側では構造異なり, 両地域の間が構造境界になっているらしい. また, このような地域での地震発生を理解することは, 同様な他の地域における地震発生予測にも不可欠であり, 社会的にも強く要請されることである. 更に, 本調査研究では, 強震観測・建物被害や地震による災害の救援などを調査から被害の特徴と要因を明らかにし, 震源断層に関する理学的研究と連携させて実施した. 強震観測によれば, この断層面は, 震源域南西側の余震分布でみられる南東傾斜である可能性が強いが, 本震の位置はこの北西傾斜の地震群の中にある可能性がある. GPS観測では, 観測点が陸域に限られているために, この地震の断層モデルを特定するには至らなかったが, 予稿変動を捉え, その時定数(decay time)0.35-2.83日と求まった.平成20年度は, その研究成果をとりまとめた.

At 10:13 on July 16, 2007, a 6.8 earthquake occurred in Niigata Prefecture, with an earthquake source of approximately 17km deep in Kamechugotsu Oki. Niigata Prefecture and Nagano Prefecture reported that the maximum intensity of the earthquake was 6.0, and the large earthquake was damaged. The shallow earthquake in the earth's crust. The current earthquake, the unknown fault that lies on the fault, the earthquake source fault, the earthquake source fault, The sea and land are connected, and the precise spatial distribution of aftershocks and other earthquakes are measured and necessary. The distribution of aftershocks in the area, the source fault and the state of the earthquake. In the future, it will be important to examine the occurrence of earthquakes in the same region. As of this survey in 2019, a total of 79 submarine seismic measurement stations and temporary onshore measuring points have been installed. The precise spatial distribution of aftershocks is required. This time's activity is based on the correct shape of the fault and the estimation of the nature of the main earthquake. The results of the aftershock area are based on the southwestern side of the aftershock area and the southeastern tilt of the aftershock distribution. The north-east side, north-west and south-south slopes are equally inclined, and the structure is mixed with the same structure. The north-east side and south-west side have different structures.両区の间がstructural realmになっているらしい. The earthquake in the same area as the one in the same area cannot be predicted. The strength of the society should be improved by the strength of society. More information, this survey research is, Observation of strong earthquakes and damage to buildings, rescue of earthquakes and disasters, investigation of special causes of damage, The study of earthquake source fault and its connection with the science of science and technology. The strong earthquake detection and detection of strong earthquakes, the fault surface of the earthquake, The distribution of aftershocks on the south-west side of the earthquake source area has a strong possibility of tilting to the south-east, and the location of the main earthquake has a possibility of tilting to the northwest of the earthquake group. GPS measurement is not possible, Observe the measurement point of the land area and the limit of the earthquake, and the fault of the earthquake and the specific area of the terrestrial area, and the original manuscript is moved and caught. Decay time (decay time) 0.35-2.83 days とまった. Heisei 20 year は, その research results をとりまとめた.