Title: Broadband Earthquake Monitoring at OAUIFE Station, Nigeria
1Broadband Earthquake Monitoring at OAUIFE
Station, Nigeria
- Dr Adepelumi, A. A
- Department of Geology,
- Obafemi Awolowo University,
- Ile-Ife, Osun State
- Email adepelumi_at_gmail.com or aadepelu_at_oauife.edu.
ng - Phone 234-08067163658
1st January, 2009
2Seismology
- In November 2007, Guralp system was installed at
OAUIFE seismic station (7º 31'23"N and 4º31'27"E)
through the funding provided by UNESCO office in
Italy. - Inverter and Solar Panel were installed in
November 2008 for the smooth running of the
seismic station.
3(No Transcript)
4Some of the Events Recorded at OAUIFE Earthquake
station
5Iceland May 29, 2008
6Mexico Event- 2008
7Tonga Event- 2008
8OAUIFE Observatory
9Earthquake Facilities at OAUIFE
10Properties of the Seismometer
11Iceland Earthquake
- "Iceland is sitting on a plate boundary where the
North America and Eurasian plates are drifting
apart. So earthquakes are common but large
earthquakes are relatively rare," - On 29th May, 2008, A strong earthquake measuring
6.1 hit southern Iceland, 50km from the capital,
Reykjavik. - The US Geological Survey said the earthquake
struck at 1546 GMT at a shallow 6.2 miles (10
km). The earthquake was also picked at the same
time at OAUIFE
12Implication of the Iceland Teleseismic to Nigeria
- Insights into the structure of the upper mantle
beneath Southwestern Nigeria. - Lithospheric structure of Southwestern Nigeria
from the teleseismic data. - Insights into the Crustal structure beneath
Southwestern Nigeria. - Character and kinematics of the Megashear systmem
in the Gulf of Guinea Implications for tectonic
evolution of Southwestern Nigeria.
13Iceland Earthquake (OAUIFE)
14Iceland Earthquake - Sandpoint, USA
15Nigeria as a case study
16Recent Seismicity in Nigeria
- Although, no active faults have been established
in Nigeria, however, a careful review of
seismicity record in Nigeria had showed that
Nigeria may not be aseismic as has hitherto been
believed. - Recent events in Nigeria Ijebu-Ode (July and
August, 1984) Gulf of Guinea (December, 1984).
Warri (1933), Lagos (1939) Umuahia (July, 1961)
Kundunnu, Bauchi (1981) Dambatta, Kano (July,
1975) Yola ( December, 1984) and Gombe (June,
1985). - Thus monitoring and prediction of earthquake
hazards could begin by a proper documentation of
the pathways through which they emanate, using
seismological data.
17Long Term Earthquake Prediction Southwestern
Nigeria
- The Empirical Earthquake Recurrence Model a
time-dependent model, was employed to predict the
probabilistic occurrences of earthquakes in the
Ijebu-Ode and environs between the year 2008 and
2028. - This probability model takes the mean recurrence
intervals and standard deviation of historic
earthquake events in this area in order to
determine the probability of earthquakes
occurrence for the predicted years.
18Probability of Recurrence of Earthquake of
Intensity V-VII in Southwestern Nigeria
19Probability of Recurrence of Earthquake of
Intensity V-VII in Southwestern Nigeria
- The results of the model showed that the
probability of earthquake occurrence in the study
area between the year 2008 and 2028 increased
from 2.8 to 91.1. - The result also showed that the probability of 2
events occurring has the highest likelihood
within the predicted years.
20Conclusion
- Therefore, it is instructive as a necessary
measure to henceforth incorporate seismic
criteria in the site investigations for design
and construction of major and sensitive
structures like Nuclear power plants the country
is seriously considering as alternative source of
energy for electricity generation, whose sudden
damage can lead to disruption of major essential
services, loss of lives and property and general
degradation of the environment. - Long Term Earthquake Monitoring should be
embraced by Nigeria.
21Future Plans
- Expand OAUIFE network to a comprehensive and
effective earthquake Information System Center - Acquire through UNESCO more sensitive
seismometers that will serve as a Early
Earthquake Warning System - Study the Crustal and Mantle structure beneath
Southwestern Nigeria.
22Acknowledgments
- UNESCO and TWAS for the financial support.
- Dr. Eck van, Torild for support.