Kimiyuki Asano
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View article: Source rupture process of the MW 6.2 earthquake in the Noto Peninsula, central Japan, on May 5, 2023
Source rupture process of the MW 6.2 earthquake in the Noto Peninsula, central Japan, on May 5, 2023 Open
An M JMA 6.5 crustal earthquake occurred during earthquake swarm activity around the northeastern tip of the Noto Peninsula, central Japan, on May 5, 2023. To elucidate the position of this earthquake in the continuing seismic swarm activi…
View article: Softening and Recovery of Near‐Surface Layers During the 2024 M7.6 Noto Earthquake
Softening and Recovery of Near‐Surface Layers During the 2024 M7.6 Noto Earthquake Open
On 1 January 2024, a devastating M J 7.6 earthquake occurred on the Noto Peninsula in Japan. When such a strong earthquake occurs, affected near‐surface soil layers behave nonlinearly and may undergo some structural changes driven by Flow …
View article: Constraint on the background stress in the source region of the 2016 Kumamoto earthquake sequence based on temporal changes in elastic strain energies and coseismic stress rotation
Constraint on the background stress in the source region of the 2016 Kumamoto earthquake sequence based on temporal changes in elastic strain energies and coseismic stress rotation Open
SUMMARY We investigated the deviatoric stress magnitude of the background stress fields before the 2016 Kumamoto earthquake sequence in Japan based on temporal changes in elastic strain energies caused by the mainshock and coseismic stress…
View article: Microtremor array surveys and development of the velocity model in the Hakodate Plain, Hokkaido, Japan
Microtremor array surveys and development of the velocity model in the Hakodate Plain, Hokkaido, Japan Open
The Hakodate Plain in the southern part of the Oshima Peninsula, Hokkaido, Japan, is a sedimentary basin surrounded by mountains. The vertical displacements caused by active faults along the western margin of the Hakodate Plain increased t…
View article: Additional file 6 of Microtremor array surveys and development of the velocity model in the Hakodate Plain, Hokkaido, Japan
Additional file 6 of Microtremor array surveys and development of the velocity model in the Hakodate Plain, Hokkaido, Japan Open
Additional file 6. Observed phase velocity and its standard deviation at NNE in the CSV format.
View article: Additional file 2 of Microtremor array surveys and development of the velocity model in the Hakodate Plain, Hokkaido, Japan
Additional file 2 of Microtremor array surveys and development of the velocity model in the Hakodate Plain, Hokkaido, Japan Open
Additional file 2. Observed phase velocity and its standard deviation at HAK in the CSV format.
View article: Additional file 7 of Microtremor array surveys and development of the velocity model in the Hakodate Plain, Hokkaido, Japan
Additional file 7 of Microtremor array surveys and development of the velocity model in the Hakodate Plain, Hokkaido, Japan Open
Additional file 7. The top depth of each velocity layer for each mesh in the three-dimensional velocity model in the Hakodate Plain constructed in this study in the CSV format.
View article: Additional file 4 of Microtremor array surveys and development of the velocity model in the Hakodate Plain, Hokkaido, Japan
Additional file 4 of Microtremor array surveys and development of the velocity model in the Hakodate Plain, Hokkaido, Japan Open
Additional file 4. Observed phase velocity and its standard deviation at KMI in the CSV format.
View article: Additional file 5 of Microtremor array surveys and development of the velocity model in the Hakodate Plain, Hokkaido, Japan
Additional file 5 of Microtremor array surveys and development of the velocity model in the Hakodate Plain, Hokkaido, Japan Open
Additional file 5. Observed phase velocity and its standard deviation at OON in the CSV format.
View article: Additional file 3 of Microtremor array surveys and development of the velocity model in the Hakodate Plain, Hokkaido, Japan
Additional file 3 of Microtremor array surveys and development of the velocity model in the Hakodate Plain, Hokkaido, Japan Open
Additional file 3. Observed phase velocity and its standard deviation at MHR in the CSV format.
View article: VARIATION IN SOURCE CHARACTERISTICS OF REPEATING M6-CLASS PLATE-BOUNDARY EARTHQUAKES OFF KESENNUMA, NORTHEAST JAPAN
VARIATION IN SOURCE CHARACTERISTICS OF REPEATING M6-CLASS PLATE-BOUNDARY EARTHQUAKES OFF KESENNUMA, NORTHEAST JAPAN Open
Nowadays, the scenario-based strong motion prediction is strongly required quantitatively to show its diversity and uncertainty. We focus on the variation or uncertainty in source parameters such as the size and stress drop of the strong m…
View article: Three-dimensional velocity structure model of Nara Basin
Three-dimensional velocity structure model of Nara Basin Open
将来の地震の地震動予測をより高精度にするため，既往の知見と既往の物理探査・地震観測データを融合して奈良盆地の堆積層の3次元速度構造モデルを構築した．奈良盆地は，大都市圏に比べ地下構造の探査情報が少ないが，盆地を埋積する堆積層には大阪盆地のそれと共通性があると考えられるため，大阪盆地の3次元速度構造のモデル化で培われた知見や技術を利用して奈良盆地の3次元モデルを構築した．重力異常から推定された基盤岩深度と盆地中央部のボーリングで得られた大阪層群の海成粘土等の情報を組み合わせて…
View article: Source, Propagation Path, and Site Characteristics Separated from Strong Motion Records during the 2016 Kumamoto, Japan, Earthquake Sequence
Source, Propagation Path, and Site Characteristics Separated from Strong Motion Records during the 2016 Kumamoto, Japan, Earthquake Sequence Open
2016年熊本地震および一連の地震活動による熊本県および周辺177地点での強震記録に対してスペクトルインバージョン法を適用し, 震源・伝播経路・サイトの各特性を分離した．地震基盤から地表までのS波サイト増幅特性は, 平野や盆地内の観測点では他点に比べ1 Hz付近で大きな値を示した．分離した182地震（MJMA: 3.0-5.5）の震源スペクトルから推定した応力降下量には, 震源深さ依存性が見られた．また, 分離したQs値は, 0.5-10 Hzの周波数帯域でQs=73.5f…
View article: Variation in Source Characteristics of Repeating M6-class Plate-boundary Earthquakes Off Kesennuma, Northeast Japan
Variation in Source Characteristics of Repeating M6-class Plate-boundary Earthquakes Off Kesennuma, Northeast Japan Open
強震動予測において，震源パラメータの不確実性を考慮して予測結果のばらつきを提示することが強く意識されるようになってきた．本研究では，震源特性のばらつきに注目し，気仙沼沖で約15年の平均繰り返し間隔で発生するM6級のプレート境界地震を例に，直近4回の地震の強震動生成域（SMGA）を推定した．その結果，1973年，1986年，2002年の地震は1つのSMGA， 2015年の地震は2つのSMGAで観測強震記録の特徴を説明できた． 2015年のSMGA1及び1973年，1986年，…
View article: Three-dimensional Subsurface Structure Model beneath the Wakayama Plain and Strong Ground Motion Prediction for the Median Tectonic Line
Three-dimensional Subsurface Structure Model beneath the Wakayama Plain and Strong Ground Motion Prediction for the Median Tectonic Line Open
和歌山平野における反射法探査と重力探査情報から，基盤岩上面深度とP波速度の空間分布を推定した．次に，同平野と似た堆積環境である大阪平野・京都盆地における既存の深層ボーリングデータから導出した物性値（P波速度，S波速度及び密度）間の関係式を用いて，主に菖蒲谷層からなる堆積層のS波速度及び密度の分布を推定した．さらに，既存の浅層ボーリングデータに基づき沖積層厚さ分布を推定した．これら3つの推定結果を統合して和歌山平野の3次元地下構造モデルを構築し，単点微動観測によるH/Vスペク…
View article: Surface wave group velocity in the Osaka sedimentary basin, Japan, estimated using ambient noise cross-correlation functions
Surface wave group velocity in the Osaka sedimentary basin, Japan, estimated using ambient noise cross-correlation functions Open
Inter-station cross-correlation functions estimated using continuous ambient noise or microtremor records were used to extract the seismic wave propagation characteristics of the Osaka sedimentary basin, Japan. Temporary continuous observa…
View article: Source rupture processes of the foreshock and mainshock in the 2016 Kumamoto earthquake sequence estimated from the kinematic waveform inversion of strong motion data
Source rupture processes of the foreshock and mainshock in the 2016 Kumamoto earthquake sequence estimated from the kinematic waveform inversion of strong motion data Open
The 2016 Kumamoto earthquake sequence started with an MJMA 6.5 foreshock occurring along the northern part of the Hinagu fault, central Kyushu, Japan, and the MJMA 7.3 mainshock occurred just 28 h after the foreshock. We analyzed the sourc…
View article: The Earthquake‐Source Inversion Validation (SIV) Project
The Earthquake‐Source Inversion Validation (SIV) Project Open
Finite-fault earthquake source inversions infer the (time-dependent) displacement on the rupture surface from geophysical data. The resulting earthquake source models document the complexity of the rupture process. However, multiple source…
View article: Modelling of wave propagation and attenuation in the Osaka sedimentary basin, western Japan, during the 2013 Awaji Island earthquake
Modelling of wave propagation and attenuation in the Osaka sedimentary basin, western Japan, during the 2013 Awaji Island earthquake Open
On 2013 April 13, an inland earthquake of Mw 5.8 occurred in Awaji Island, which forms the western boundary of the Osaka sedimentary basin in western Japan. The strong ground motion data were collected from more than 100 stations within th…
View article: Development of fully Bayesian multiple-time-window source inversion
Development of fully Bayesian multiple-time-window source inversion Open
In the estimation of spatiotemporal slip models, kinematic source inversions using Akaike's Bayesian Information Criterion (ABIC) and the multiple-time-window method have often been used. However, there are cases in which conventional ABIC…
View article: An Overview of Source Models from Strong Motion Records of the 2011 Tohoku Earthquake
An Overview of Source Models from Strong Motion Records of the 2011 Tohoku Earthquake Open
2011年東北地方太平洋沖地震では、遠地地震波形・強震波形・測地・津波等の稠密な公開観測記録に基づき、多数の震源解析結果が提示された。本稿では、強震記録を用いて推定された震源モデルを対象に、共通点と相違点に着目して概説する。周期約10秒以上の長周期帯域で解かれた震源インバージョン結果からは、震源付近および海溝軸付近に大すべり域が推定された。一方、周期約10秒以下の短周期帯域を説明する強震動生成域や強震動パルス生成域は、震源付近および陸域側に大きな応力降下を伴う領域が複数推定…