Visualization of Seismic Wavefields and Strong Ground Motions Using Data from a Nationwide Strong-Motion Network and Large-Scale Computer Simulation

2009 ◽  
pp. 257-272
Author(s):  
Takashi Furumura
Keyword(s):  
Computer Simulation ◽  
Large Scale ◽  
Ground Motions ◽  
Strong Motion ◽  
Strong Ground Motions ◽  
Using Data ◽  
Strong Motion Network ◽  
Strong Ground

Strong-Motion Records Obtained by an Array Observation System During the 2011 Great East Japan Earthquake

2012 ◽  
Vol 7 (6) ◽  
pp. 672-681 ◽  
Author(s):  
Makoto Kamiyama ◽  
◽  
Tadashi Matsukawa ◽  
Masahiro Anazawa
Keyword(s):  
Ground Motions ◽  
Strong Motion ◽  
Great East Japan Earthquake ◽  
Observation System ◽  
Soil Conditions ◽  
Severe Damage ◽  
Local Site Effects ◽  
Strong Ground Motions ◽  
Local Site ◽  
Strong Ground

Small-Titan, an array system deployed in Sendai City and used for observing strong ground motion succeeded in obtaining strong ground motions at many sites during the 2011 Great East Japan Earthquake. Small-Titan installed in 1998 to investigate local site effects on strong ground motions consists of 20 observation sites with different soil conditions and has obtained over 500 records of various kinds of earthquakes since its installation. The 2011 Great East Japan Earthquake caused severe damage in Sendai City, including that from a tsunami. One site of the Small-Titan system was also hit by a tsunami. This paper describes the background leading to the success of the records of observation of strong motion by Small-Titan for this earthquake and outlines characteristics of records.

scholarly journals Evaluation of the Strong Ground Motions in the Area Close to the Surface Faults

2018 ◽  
Vol 12 (04) ◽  
pp. 1841002
Author(s):  
Kiyoshi Irie ◽  
Dorjpalam Saruul ◽  
Kazuo Dan ◽  
Haruhiko Torita
Keyword(s):  
Seismic Waves ◽  
Ground Motions ◽  
Strong Motion ◽  
Strike Slip ◽  
Reverse Fault ◽  
Surface Layers ◽  
Period Range ◽  
Strong Ground Motions ◽  
Seismogenic Layer ◽  
Strong Ground

In Japan, the seismic waves radiated from the fault in the surface layers above the seismogenic layer are not considered in the usual strong motion prediction. However, in the inland crustal earthquakes, the strong ground motions in the areas close to the surface faults could be influenced by the seismic waves radiated from the fault in the surface layers. Hence, we evaluated the seismic waves radiated from vertical strike-slip and dipping reverse faults in the surface layers to investigate their influence on the strong motions. The results of the strike-slip fault showed that the seismic waves of the fault normal (FN) component were larger than those of the fault parallel (FP) component in the period range of 0.5–5 s. At least, 80–90% of the FN component was attributed to the seismic wave radiated from the fault in the seismogenic layer. Almost 100% of the FP component was attributed to the seismic waves radiated from the fault in the surface layers. On the other hand, the results of the reverse fault showed that the seismic waves were not attributed to those from the fault in the surface layers.

Estimation of a Source Model and Strong Motion Simulation for Tacna City, South Peru

2014 ◽  
Vol 9 (6) ◽  
pp. 925-930 ◽  
Author(s):  
Nelson Pulido ◽  
◽  
Shoichi Nakai ◽  
Hiroaki Yamanaka ◽  
Diana Calderon ◽  
...  
Keyword(s):  
Large Scale ◽  
Ground Motions ◽  
Random Noise ◽  
Distribution Model ◽  
Small Scale ◽  
Tsunami Modelling ◽  
Southern Peru ◽  
Strong Ground Motions ◽  
Megathrust Earthquakes ◽  
Strong Ground

We estimate several scenarios for source models of megathrust earthquakes likely to occur on the Nazca-South American plates interface in southern Peru. To do so, we use a methodology for estimating the slip distribution of megathrust earthquakes based on an interseismic coupling (ISC) distribution model in subduction margins and on information about historical earthquakes. The slip model obtained from geodetic data represents large-scale features of asperities within the megathrust that are appropriate for simulating long-period waves and tsunami modelling. To simulate broadband frequency strong ground motions, we add small scale heterogeneities to the geodetic slip by using spatially correlated random noise distributions. Using these slip models and assuming several hypocenter locations, we calculate a set of strong ground motions for southern Peru and incorporate site effects obtained from microtremors array surveys in Tacna, the southernmost city in Peru.

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.

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