SEISMIC RISK ANALYSIS IN SOUTHWEST-GERMANY
Based on Satellite RADAR - DATA
Barbara Theilen-Willige
University of Karlsruhe
ISPRS WG VII/7
KEY WORDS: Remote Sensing, Geology, Radar, Research,
lineament analysis, earthquake vulnerability, landslides
ABSTRACT
The integrated analysis of geologic and seismologic data, field
observations, lineament data derived from satellite radar images
(ERS-1, SIR-C) from Southwest-Germany allows a better understanding of
the tectonic setting and a more detailed identification of fault
zones. Comparisons of lineament maps with seismotectonic data suggest
that some of the most prominant visible lineament zones are
deap-seated structures. Radar-lineament maps were compared with
available isoseismal maps of stronger earthquakes (intensity of 6-8 on
the MSK-scale). The interpretation of satellite radar data contributes
to a better knowledge of the influence of local structural conditions
on seismic wave radiational propagation and on ground motions.
1. GEOTECTONIC SETTING
Southern Germany as a tectonic and seismo-
tectonic unit has a shape of a triangle,
triangle, bordered by the following struc-
tures: the Upper Rhinegraben in the west,
the Prealpine Molasse basin in the south
and the Bohemian Massif in the northeast
(Fig.1). Beginning with the Swabian Jura
earthquake in 1911 the seismic activity in
Central Europe is concentrated to this
area. As far as it can be seen from
historic records from the time before 1800
a shock of the quality as those in 1911,
1943 and 1978 has not been observed in
this area (SCHNEIDER,1979,1980).
As can be deduced from fault-plane Fig.1: Tectonic Units in Europe
solutions, the prominent type of (Schneider,1980)
seismotectonic motions consists of
horizontal strike slip motiones along
Vogelsber
NNE or NW directions (Fig.2). From the Massit c gen
distribution of epicenters and the PE Bohemia:
orientation of fault planes it can be e ur Massif
concluded that the axis of main principal ;
stress is oriented about NNW (SCHNEIDER,
1980, GRUNTHAL & STROMEYER,1995).
2. RADAR LINEAMENT ANALYSIS
The present study is an attempt ‚to Qu NT = -
integrate various data sets (satellite
radar data, seismotectonic data, geologic
and geomorphologic field data) to obtain a des s
general better understanding of the oe 0%
tectonic setting and to improve earthquake fw > rot
vulnerability maps. oS —
ERS- ken several complete SAR ; 3 : ; as
Edere fu entire Germany. The Fig.2: Directions o Jargest Principal
processing of the data was done in the s in Southwest-Germany
German Processing and Archiving Facility (Schneider,1980)
(D-PAF) at German Remote Sensing Data
Center (DFD) of the DLR/ Oberpfaffenhofen.
705
International Archives of Photogrammetry and Remote Sensing. Vol. XXXI, Part B7. Vienna 1996
