GEOINFORMATION SYSTEMS FOR STUDYING SEISMICITY AND IMPACT CRATERING USING REMOTE SENSING DATA - Geographic Information Systems (GIS) - page 167

curve vs. time b(t) , etc. The empirical regression line of the magnitude-
frequency function is obtained using the maximum-likelihood and least
squares methods. The b -values can be also estimated using Utsu's formula
[34], without calculating the N(M) function, to a better accuracy than with the
least squares.
Table 1. Structure, format and content of the GIS EEDB geographic
database and the relevant geographic layers

Data format Folder Layer names Information content

Raster data
(files *.bin)

Raster Relief Digital elevation model

Coast Data on coastlines

Rivers Global network of rivers and lakes

Detailed local networks of rivers and
lakes

River details

Country National frontiers

Republics Frontiers of autonomous republics

Administrative
units

Administrative division

Roads Roadway network

Railways Railway network

Vector data
(files *.vec)

Vector Plates Plate boundaries

Tectonic
Zones

Seismic lineaments

Faults Fault zones

Thrust Thrust faults

Normal Normal faults

Oblique-slip Oblique-slip faults

Reverse Reverse faults

Reverse-
oblique

Reverse-oblique-slip faults

Cities Cities and towns

Earthquakes Earthquake epicenters

Volcanoes Locations of volcanoes

TideNet Tsunami observation points

Point data
(files *.txt)

SeismNet Seismic observation points

Point

Mag points Tectonomagnetic observation points

Vertics of regions covered by
different catalogs

Regions

Mech points Earthquake focal mechanisms

Computable
data

Grid Geographical network