scholarly journals CHARACTERIZED FAULT MODEL FOR PREDICTION OF STRONG GROUND MOTIONS FROM INTRA-SLAB EARTHQUAKES

2006 ◽  
Vol 71 (600) ◽  
pp. 35-42
Author(s):  
Kazuo DAN ◽  
Takayoshi MUTO ◽  
Jun'ichi MIYAKOSHI ◽  
Motofumi WATANABE
Keyword(s):  
Ground Motions ◽  
Fault Model ◽  
Strong Ground Motions ◽  
Strong Ground

Fault Model of the 1804 Kisakata Earthquake (Akita, Japan)

2020 ◽  
Vol 91 (5) ◽  
pp. 2674-2684 ◽  
Author(s):  
Kentaro Imai ◽  
Shinsuke Okada ◽  
Narumi Takahashi ◽  
Yuichi Ebina ◽  
Yoshinobu Tsuji
Keyword(s):  
Crustal Deformation ◽  
Field Survey ◽  
Ground Motions ◽  
Fault Model ◽  
Historical Documents ◽  
Ocean Bottom ◽  
Tsunami Height ◽  
Strong Ground Motions ◽  
Strong Ground ◽  
Extensive Damage

Abstract The 10 July 1804 Kisakata earthquake occurred offshore Kisakata (Akita, Japan), and widespread felt shaking was reported from Matsumae (Hokkaido) to Ohmi-Hachiman (Shiga Prefecture). The earthquake caused strong ground motions that extensively damaged areas near the epicenter, such as along the coast of Kisakata, and the resultant tsunami caused extensive damage along the coast from Kisakata to Sakata. Furthermore, Kisakata lagoon was uplifted by dislocation during the earthquake, exposing the lagoon floor. Here, we performed a field survey of the uplift distribution based on microtopographic remnants of the former shoreline of Kisakata lagoon and used historical documents to re-evaluate tsunami trace heights. Using ocean-bottom reflection profiles, we estimated a fault model for the earthquake and resultant tsunami. Our model indicates that an average of 5.6 m of slip on the fault (equivalent to an Mw 7.1 earthquake) is required to explain the observed crustal deformation and tsunami height distributions, and back correction of the modeled slip reproduced well the former shoreline of Kisakata lagoon.

scholarly journals Broadband Strong-Motion Prediction for Future Nankai-Trough Earthquakes Using Statistical Green’s Function Method and Subsequent Building Damage Evaluation

2021 ◽  
Vol 11 (15) ◽  
pp. 7041
Author(s):  
Baoyintu Baoyintu ◽  
Naren Mandula ◽  
Hiroshi Kawase
Keyword(s):  
Green’S Function ◽  
Green's Function ◽  
Nankai Trough ◽  
Ground Motions ◽  
Building Damage ◽  
Steel Buildings ◽  
Ground Acceleration ◽  
Attenuation Relations ◽  
Strong Ground Motions ◽  
Strong Ground

We used the Green’s function summation method together with the randomly perturbed asperity sources to sum up broadband statistical Green’s functions of a moderate-size source and predict strong ground motions due to the expected M8.1 to 8.7 Nankai-Trough earthquakes along the southern coast of western Japan. We successfully simulated seismic intensity distributions similar to the past earthquakes and strong ground motions similar to the empirical attenuation relations of peak ground acceleration and velocity. Using these results, we predicted building damage by non-linear response analyses and find that at the regions close to the source, as well as regions with relatively thick, soft sediments such as the shoreline and alluvium valleys along the rivers, there is a possibility of severe damage regardless of the types of buildings. Moreover, the predicted damage ratios for buildings built before 1981 are much higher than those built after because of the significant code modifications in 1981. We also find that the damage ratio is highest for steel buildings, followed by wooden houses, and then reinforced concrete buildings.

Sign in / Sign up

Export Citation Format

Share Document