Extreme Accelerations During Earthquakes Caused by Elastic Flapping Effect
Accurate recording of large, earthquake-induced ground shaking is critical for our understanding of earthquake physics as well as seismic hazard assessment. Extremely large accelerations with the peak value of 3.2 times the gravity acceleration were recorded at seismic station WTMC located in northe...
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| Veröffentlicht in: | Scientific reports 2019-02, Vol.9 (1), p.1117-1117, Article 1117 |
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| description | Accurate recording of large, earthquake-induced ground shaking is critical for our understanding of earthquake physics as well as seismic hazard assessment. Extremely large accelerations with the peak value of 3.2 times the gravity acceleration were recorded at seismic station WTMC located in northern South Island of New Zealand during the recent magnitude 7.8 Kaikoura earthquake. However, the mechanisms responsible for the generation of such large accelerations are not well understood. Here we use numerical simulations to examine a range of physical models that can reproduce the observed characteristics of the acceleration record. We find that the record of the asymmetric, vertical accelerations, also observed during a magnitude 6.3 earthquake, can be explained by a flapping effect, that is, the local, elastic bouncing of a foundation slab on which the sensor is installed. Our results suggest that the extremely large accelerations recorded at seismic station WTMC do not reflect the actual ground shaking, but were caused by a local, system response around the sensor. Our finding has important implications for both the evaluation of future seismic hazard based on the waveform records of the Kaikoura earthquake and the installation methodology of strong-motion seismometers in all earthquake prone countries. |
| doi_str_mv | 10.1038/s41598-018-37716-y |
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| subjects | 639/166/986 704/2151/508 704/4111 Earthquakes Humanities and Social Sciences multidisciplinary Science Science (multidisciplinary) Seismic activity Seismic hazard |
| title | Extreme Accelerations During Earthquakes Caused by Elastic Flapping Effect |
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