| Autor: |
UMEDA, Yasuhiro, ITO, Kiyoshi, KATO, Mamoru, ARBOLEDA, R.D. |
| Jazyk: |
japonština |
| Rok vydání: |
1991 |
| Předmět: |
|
| Zdroj: |
京都大学防災研究所年報. B. 34(B-1):211-219 |
| ISSN: |
0386-412X |
| Popis: |
A large earthquake (M=7.8) struck the central area of Luzon Island on July 16, 1990. A number of stones were thrown out from the former sockets by severe shaking of the main shock. The dislodged boulders and cobbles were distributed within 30 km in north-south and about 10 km in east-west directions form the town of Rizal. The high accelerations of 2.6-3.3g were estimated from the dislodged distances of 45-58 cm, assuming that the seismic waves had a frequency of 3 Hz.By using the dislodged distances of 71 stones which were measured at various areas, the source of great vibration was determined at 7 km south-southeast of Rizal town. The displacement as well as calculated ground accelerations and velocities decrease with distance from this source. The result shows that the survey of thrown-out stones in the epicentral area is effective to estimate the high accelerations exceeding earth's gravity(1g). |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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