scholarly journals Three-dimensional cooling pattern of a granitic pluton II: The study of deuteric sub-solidus reactions in the Toki granite, Central Japan

2011 ◽  
Vol 106 (3) ◽  
pp. 130-141 ◽  
Author(s):  
Takashi YUGUCHI ◽  
Tadahiko TSURUTA ◽  
Tadao NISHIYAMA
Keyword(s):  
Three Dimensional ◽  
Central Japan ◽  
Granitic Pluton ◽  
Cooling Pattern

Thermochronology and the three-dimensional cooling pattern of a granitic pluton: an example from the Toki granite, Central Japan

2011 ◽  
Vol 162 (5) ◽  
pp. 1063-1077 ◽  
Author(s):  
Takashi Yuguchi ◽  
Kenji Amano ◽  
Tadahiko Tsuruta ◽  
Tohru Danhara ◽  
Tadao Nishiyama
Keyword(s):  
Three Dimensional ◽  
Central Japan ◽  
Granitic Pluton ◽  
Cooling Pattern

scholarly journals Evaluating variability in coseismic slips of paleoearthquakes from an incomplete slip history: an example from displaced terrace flights across the Kamishiro fault, central Japan

2021 ◽  
Vol 8 (1) ◽  
Author(s):  
Naoya Takahashi ◽  
Shinji Toda
Keyword(s):  
Monte Carlo ◽  
Three Dimensional ◽  
Seismic Hazard Assessment ◽  
Probabilistic Seismic Hazard Assessment ◽  
Reverse Fault ◽  
Central Japan ◽  
Systematic Analysis ◽  
Fluvial Terraces ◽  
Rupture Length ◽  
Slip History

AbstractExamining the regularity in slip over seismic cycles leads to an understanding of earthquake recurrence and provides the basis for probabilistic seismic hazard assessment. Systematic analysis of three-dimensional paleoseismic trenches and analysis of offset markers along faults reveal slip history. Flights of displaced terraces have also been used to study slips of paleoearthquakes when the number of earthquakes contributing to the observed displacement of a terrace is known. This study presents a Monte Carlo-based approach to estimating slip variability using displaced terraces when a detailed paleoseismic record is not available. First, we mapped fluvial terraces across the Kamishiro fault, which is an intra-plate reverse fault in central Japan, and systematically measured the cumulative dip slip of the mapped terraces. By combining these measurements with the age of the paleoearthquakes, we estimated the amount of dip slip for the penultimate event (PE) and antepenultimate event (APE) to be 1.6 and 3.4 m, respectively. The APE slip was nearly three times larger than the most recent event of 2014 (Mw 6.2): 1.2 m. This suggests that the rupture length of the APE was much longer than that of the 2014 event and the entire Kamishiro fault ruptured with adjacent faults during the APE. Thereafter, we performed the Monte Carlo simulations to explore the possible range of the coefficient of variation for slip per event (COVs). The simulation considered all the possible rupture histories in terms of the number of events and their slip amounts. The resulting COVs typically ranged between 0.3 and 0.54, indicating a large variation in the slip per event of the Kamishiro fault during the last few thousand years. To test the accuracy of our approach, we performed the same simulation to a fault whose slip per event was well constrained. The result showed that the error in the COVs estimate was less than 0.15 in 86% of realizations, which was comparable to the uncertainty in COVs derived from a paleoseismic trenching. Based on the accuracy test, we conclude that the Monte Carlo-based approach should help assess the regularity of earthquakes using an incomplete paleoseismic record.

scholarly journals Shallow subsurface three-dimensional geological model using borehole logs in Tokyo Bay area, central Japan

2013 ◽  
Vol 119 (8) ◽  
pp. 554-566 ◽  
Author(s):  
Yoshiro Ishihara ◽  
Yuki Miyazaki ◽  
Chikako Eto ◽  
Shiori Fukuoka ◽  
Katsumi Kimura
Keyword(s):  
Three Dimensional ◽  
Tokyo Bay ◽  
Geological Model ◽  
Central Japan ◽  
Shallow Subsurface ◽  
Bay Area ◽  
Borehole Logs

scholarly journals Three-dimensional Attenuation Structure beneath the Tokai Region, Central Japan Derived Using Local Earthquake Spectra

2012 ◽  
Vol 65 (2) ◽  
pp. 175-187 ◽  
Author(s):  
Hiroyuki TAKAOKA ◽  
Noriko TSUMURA ◽  
Fukusuke TAKAHASHI ◽  
Kenji NOZAKI ◽  
Aitaro KATO ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Central Japan ◽  
Local Earthquake ◽  
Attenuation Structure ◽  
Tokai Region
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