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| Titel |
Origin of anomalous Earthquake Early Warning Parameter Values for earthquakes in the Ibero-Maghrebian Region |
| VerfasserIn |
Marta Carranza, Elisa Buforn, Aldo Zollo |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250102255
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| Publikation (Nr.) |
 EGU/EGU2015-1564.pdf |
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| Zusammenfassung |
| We have studied the anomalous values of the predominant period τc and peak displacement Pd measured offline from the initial P-wave (3 sec time window) of several earthquakes occurred at the Ibero-Maghrebian region. Understanding the origin of these anomalous values is of a great importance in view of the development of an Earthquake Early Warning System (EEWS), since they can lead to missed and false alarms by a wrong estimation of the magnitude. In particular, we have observed lower τc values at stations such as ESPR, EGRO or EADA, for earthquakes occurred at the SW of Iberian Peninsula and higher τc for earthquakes occurred at S and SE of Iberian Peninsula. These anomalous values may be correlated with the ray path. Due to the large variability of attenuation in the whole region, different correction of Pd with distance must be used. We have analyzed the effect of expanding the P-wave time window for the magnitude estimation and explained the magnitude underestimation for the 2003 Algerian earthquake as the possible effect of an un-sufficient P-wave window length to measure the EEW parameters |
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