|
Current Monitoring
Activities
Geologist monitoring Fogo¹²
As of April 21st, 1995,
about a month after the most recent eruption of Fogo, a
group of U.S. Geological Survey (USGS) scientists were
training some of the Cape Verde geologists on how to use
and interpret seismometer records. The USGS
scientists also worked with the Fogo geologists on
assessing "the eruptive activity and lava flows for
future hazards mitigation."¹
The following is a map
of the seismic stations that were used during the 1995
eruption:
Fig. 1. Main topographic and structural aspects of Chã
das Caldeiras, Fogo Island. The triangles show seismic
stations deployed during the 1995 Fogo eruption. Contour lines are spaced 200
m..¹¹
"Today (1995),
scientists are studying Fogo island with hopes of
understanding the ongoing eruptive activity and the
nature of any human hazards it might pose. A SPOT Pilot
Project focusing on monitoring and documenting the
results of the ongoing volcanic eruption of Fogo is
imminent. In addition, efforts are afoot to overfly the
Fogo volcano with NASA aircraft for the purpose of
airborne laser topographic observations using either
NASA airborne laser altimeter or SAR interferometer
sensors. Data will also be used to guide field studies
of the eruption, and as a basis for future volcano
monitoring studies."¹³
As of 1997, "a joint
effort is being made to implement in Fogo the basic
surveillance procedures recommended by the IAVCEI for
active volcanoes in inhabited areas, namely the
real-time monitoring of seismicity, tilt and fumarolic
ternperature, and the installation of a network of
geodetic monurnents for periodic surveying (Fonseca et
al., 1997). In addition, the application of InSAR
(synthetic aperture radar interferometry) is being
investigated as a complement to surface geodetic
observations (Amelung et al., 1997)."³³
More recently, "Fogo is
monitored with a multiparametric telemetric network of
instruments (VIGIL Network) in Fogo Island and in
neighbour Brava Island, including broadband and short
periodseismic stations and tiltmeters (Fonseca et al.,
2003). Besides (rare) volcanotectonic and longperiod
seismic events, volcanic tremor is a common observation
in the data."²
The above maps are of the monitoring systems currently
on Fogo and the neighboring island Brava, "the
Solid squares depict CMG-3T seismometers from the CVULVZ
Network (Lodge et al.,2004). The open square marks the
location of the IRIS/IDA SACV station. b) VIGIL Seismic
Network (Fonseca et al., 2003)."²²
A site that talks about
the project of monitoring Fogo:
http://einstein.fisica.ist.utl.pt/~sismo/Ingles/VIGIL/Vigil_eng.htm
(hasn't been updated since 2003 though)
|