Spatial Analysis of Remote Sensing Data in Early Stage of a Seismo-tectonic Research

Abstract

In 1901, M4.7 earthquake hit the area of NE Bohemia, Czech Republic. The Hronov-Poříčí Fault (HPF) was found responsible for the event. Ongoing seismic monitoring proves the Hronov-Poříčí Fault Zone (HPFZ) is, in fact, the second most active area in the Bohemian Massif. Despite importance of the area, the HPFZ has not been described reasonably. Up to the moment, neither length of the HPFZ nor exact locations of its south branch are clear. Vagueness in length of the HPFZ causes large uncertainty in seismic risk assessment of the area. Integrated approach based on geographic information systems and remote sensing was employed to delineate lineaments in the wider HPFZ area. NASA provided Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) data was evaluated. ASTER digital elevation model provided basic topographic characteristics (surface curvature, slope and drainage systems). Edge detecting process was employed to define lineaments. Recent seismic activity and GPS monitored movements in the area were also assessed. The digital elevation model, extracted lineament, recent seismic activity, recent movements pointed out by GPS monitoring, were integrated and analysed in a geographic information system. Fault pattern suggested previously by various authors were compared with the GIS layers, and the extracted lineaments especially. Cross examination showed there are at least three possible variants of the south termination of the HPFZ. The spatial analysis also pointed out field tectonic mapping is necessary to describe the fault in detail and where to focus the survey.