 |
| Titel |
Monitoring broadband seismic noise in the Hellenic Unified Seismic Network (HUSN) |
| VerfasserIn |
Christos Evangelidis, Nikolaos Melis, Ioannis Kalogeras |
| Konferenz |
EGU General Assembly 2011
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250053715
|
|
|
|
|
|
| Zusammenfassung |
| We investigate the characteristics of the ambient seismic noise across Greece as recorded
from the Hellenic Unified Seismic Network (HUSN). Power spectral densities (PSDs) are
estimated at ~ 100 broadband seismic stations and ~ 40 strong motion sensors daily. Using
the continuous waveform data for a 3-yr period, from 2007 to 2010, we compute the highest
probability noise levels at all stations of HUSN, and consequently, a low noise model
for Greece. This model is a realistic low noise threshold for future seismic station
installations. We also observe a very strong correlation between the microseismic noise
(4-8 sec) recorded at all HUSN stations and sea wave heights recorded at boys
deployed in the Aegean and the Ionian sea. The microseismic noise produced from sea
waves is evident at all stations, indicating that the HUSN seismic network also
monitors sea conditions. Finally, noise monitoring of all the new strong motion stations
(~ 90), that are in the process of being installed in public buildings and important
archaeological places, is performed not only for network operating purposes but also for
monitoring building’s response to future strong motions. The application of a continuous
seismic noise monitoring in both seismic and strong motion networks in Greece is
necessary, as indicates the quality of the: a) sites, b) equipment and c) network
management and maintenance. A complete database of PSDs may also be useful tool for
investigating new research directions of seismic network applications in Greece. |
|
|
|
|
|
|