Geoscience Reference
In-Depth Information
Table 5.1. Statistics onearthquakes in the vicinity ofthetest-site over the last10 year
s
Magnitude
Hypocentral
distance
>
7
6to 7
5to6
4 to 5
3to4
<
20km
4
31
20 to 50km
5
50 to 100km
1
>
100km
2
5
2.1.1. Project objectives
The main objectives during the time-period of the test-site operation have addressed the
following issues:
•
Definition of the geologic structure of the basin using geophysical and geotechnical
studies in order to fully identify both dynamic properties and geometry of the main
soilformations.
•
Studiesofseismicity,seismichazard,andattenuationofstronggroundmotionusing
alarge variety of approaches and techniques.
•
Empirical and theoretical studies of site effects with emphasis on the development
as well as the validation of existing and new numerical codes for the simulation of
ground motion.
Experimental and numerical dynamic behaviour analysis of soil-foundation-
structureinteraction for a six-storeymodel R/Cbuilding and a model bridge.
•
Contribution to the ongoing elaboration of thenew generation of Eurocode 8.
•
Creation of a database of high quality and well constrained data easily accessible
through Internet that may be used to better understand the complex phenomena,
for the validation and improvement of existing codes in all aspects of earthquake
engineering.
•
2.1.2. General description of the test site
Geometric configuration.
The area of the basin is about 15km
)
in size. The free surface is almost flat with exceptions at the northern and southern
boundaries where a series of hills and mountains define the physical limits of the basin.
Figure5.2showsacharacteristic2Dcross-sectionatthecentreofthebasinandFigure5.3
shows a map of the area of interest. In both figures, the location of sensor stations is
depicted together with some details of the geologic structure (layering, geologic back-
ground, tectonic evidences, physical limits, etc.). The sediments-bedrock boundaries
together with some important ruptures and seismic faults inside the basin form a rather
complex but at the same timevery common geologic structure.
×
8km
(
=
120km2
