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Egyptian National Seismic Network (ENSN), twenty years of continuous recoding, Egypt

Authors:
Egyptian National Seismic Network (ENSN), twenty years of
continuous recoding, Egypt
Hazem Badreldin
geo.hazem@yahoo.com
National Research Institute of Astronomy and Geophysics, Helwan, Cairo, Egypt
Egypt has experienced many damaging earthquakes in both historical and
recent time. It is one of the few regions of the World where evidence of
historical earthquake Activity has been documented over the history from
2200 B.C . The beginning of earthquake recording in Egypt started by
installing the first seismic station at Helwan (25 km south of Cairo) in
1899,by 1997 the total number of seismic stations in Egypt become 70 , most
of them are broadband . According to the general distribution of the recent
major earthquake epicenters in Egypt and vicinity, the most active seismic
zones have been divided into eight regions; Aswan, Abu Dabbab, Beni Suef,
Dahshour, The Gulf of Suez region, The Gulf of Aqaba region, Cairo Suez
district and The Northern Egyptian Continental Margin.
1-Aswan zone
2- Abu Dabbab zone
4- Beni Suef zone Gulf of Suez.
5-The Gulf of Aqaba
7- Gulf of Suez
Egyptian National Seismological Network (ENSN)
3-north-contiental-margien
The location map of the first
seismic station in Egypt
about 25 km south of Cairo)
,was installed in 1899.
In 1975 short period (three
component) Seismograph of
Kimos type (Russian type) at
Aswan , Matrouh and Abu-
Simble
In 1993, Japan International
Cooperation Agency (JICA)
supported NRIAG with a modern
Telemetered Digital network which
install and operated in 1994.
After 14 November 1981
earthquake NRIAG installed 13
seismic stations as a local
network around Kalabsha fault
and Northern Lake Nasser.
Abstract
A
B
C
D
Fig (A and B)distribution of the
earthquake epicenters and fault
plane solutions in Aswan area
,Fig (C and D) Histogram of number of earthquakes with magnitude
and depth .
Fig (A and B)distribution of the earthquake epicenters
and fault plane solutions in Beni suef area ,Fig (C and D)
Histogram of number of earthquakes with magnitude
and depth .
A
A
A
A
A
B
B2
B1
B
B
B
C D
D
D
C
D
Fig (A and B)distribution of the
earthquake epicenters and fault
plane solutions in Abu Dabba area
,Fig (C and D) Histogram of number of
earthquakes with magnitude and depth
.
Fig (A and B)distribution of the earthquake epicenters
and fault plane solutions in Gulf of Aqaba ,Fig (C and D)
Histogram of number of earthquakes with magnitude and
depth .
D
C
Recent distribution of ENSN
Recent and previous instrument at ENSN
C D
A B
Fig (A and B)distribution of the
earthquake epicenters and fault
plane solutions in north- contiental
margien, Fig (C and D) Histogram of
number of earthquakes with
magnitude and depth .
Fig (A , B1 and B2)
distribution of the
earthquake epicenters and
fault plane solutions in
northern and southern Gulf
of Suez ,Fig (C and D)
Histogram of number of
earthquakes with
magnitude and depth .
8-Dahshour area
C
Fig (A and B)distribution of the earthquake epicenters
and fault plane solutions in Dahshour area ,Fig (C and
D) Histogram of number of earthquakes with
magnitude and depth .
Fig (A and
B)distribution of
the earthquake
epicenters and
fault plane
solutions in Cairo-
Suez district ,Fig
(C and D)
Histogram of
number of
earthquakes with
magnitude and
depth .
6-north-contiental-margien
A
B
C
D
Conclusion
The First seismic station was install in Egypt in 1989.
The number of seismic stations gradually increased
to 70 seismic stations by 1997 . The most active
seismic zones in Egypt are Aswan, Abu Dabbab, Beni
Suef, Dahshour, The Gulf of Suez region, The Gulf of
Aqaba ,Cairo- Suez district and The Northern Egyptian
Continental Margin.
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