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| Primary Author
Information |
| Name |
Ivo Oprsal
|
| Affiliation |
Swiss Seismological Service, ETH Zurich, Switzerland, on leave from Faculty of Mathematics and Physics, Charles University in Prague, Czech Republic
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Co-Author Information
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| Co-Author
- 1 |
Name |
Jiri Zahradnik
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| Affiliation |
Faculty of Mathematics and Physics, Charles University in Prague, Czech Republic
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| Co-Author
- 2 |
Name |
Anna Serpetsidaki
|
| Affiliation |
Seismological Laboratory, University of Patras, Greece
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| Co-Author
- 3 |
Name |
G-Akis Tselentis
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| Affiliation |
Seismological Laboratory, University of Patras, Greece
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Abstract Information
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| Abstract Number |
1
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| Abstract Title |
3D HYBRID SIMULATION OF THE SOURCE AND SITE EFFECTS DURING THE 1999 ATHENS EARTHQUAKE
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| Presentation Style |
EITHER
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Abstract Submission
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| Speaker |
Primary Author
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| Submission |
017983-1-030131004732.htm
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| Abstract Body Preview (Your abstract is now 347 words.) |
| The damaging 1999 Athens earthquake of Mw=5.9
occurred at about 20km from the city center. The intensity distribution
in the capital, ranging from V to IX, was quite irregular due to combination
of the source, path and site effects. The 30-stations temporary network,
installed in Athens by the University of Patras, recorded and located more
than 400 aftershocks. The horizontal-to-vertical spectral ratios from the
20 selected aftershock recordings provided site classification. The most
significant anomaly (H/V exceeding 4 in the frequency range 1-4 Hz)
was found at the Ano Liosia site, belonging to the most heavily damaged
zones with intensity IX. The site is situated in a shallow basin whose
surface extent is about 4x4 km, and the maximum depth is of about 150 m.
The basin is filled with basically 3 layers. The topmost layer includes
alluvium and soft soil, the second one consists of stiff soil and
alternations of conglomerates, clay and sand, while the third layer is
represented by Neogene formations like marl, marly limestone and sandstone.
The bedrock of the basin consists of Triassic limestone and schist. Borders
of the basin, where the topmost layer directly overlies the bedrock, are
locally quite steep. Based on geophysical data (Vp, Vs,
Q) measured at the site, the numerical modeling of the seismic site response
was carried out. The 2D and 3D finite-difference techniques were used, and
significant edge effects were revealed. No recording of the mainshock is
available in Ano Liosia. Nevertheless, based on the finite-extent composite
source model, validated by the existing strong motion records in Athens, we
found that the bedrock motion in Ano Liosia had its PGA ranging from 0.2 to
0.3 g, resulting from the relatively small epicentral distance (~ 10 km) and
the forward source directivity. The source and site effects were combined
with each other by a hybrid technique (Oprsal and Zahradnik, JGR 2002),
allowing fast full-wave 3D calculations up to 10-20 Hz on a standard personal
computer, and showing that the combined source and site effect in Ano Liosia
might provide the PGA values locally exceeding 0.6 g. |
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Symposium or Workshop (First Preference)
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| Symposium or Workshop (First Preference) |
SS04
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Symposium or Workshop (Second Preference)
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| Symposium or Workshop (Second Preference) |
SW04
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Keyword One
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| Keyword One |
7209
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Keyword Two
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| Keyword Two |
7212
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Keyword Three
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| Keyword Three |
7260
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