EARTHQUAKE PREDICTION RESEARCH
Using MT Technologies For Long-Term, Continuous Earthquake Prediction
|Stationary MT monitoring systems have been installed in Japan since April of 1996, providing a continuous recording of MT signals at the Mizusawa Geodetic Observatory and the Esahi Station of the Geographical Survey Institute of Japan.
Earthquakes are often dangerous and costly, killing hundreds of people and destroying millions of dollars of property. By evaluating MT data over several years, the GSIJ hopes to be able to better understand why and when earthquakes happen. Eventually, this sort of research may allow an earthquake warning system to be created, helping to prevent some of the loss of life caused by earthquakes.
The image above shows pseudosections over time from the Sawauchi research site. The figure on the left covers the period from May to August, 2008; the figure on the right is a subset, from August 11 to 23, 2008. Significant earthquakes (M>4.0) are indicated by vertical lines and letters. This image can be downloaded as a high resolution PDF file (4 MB). More information is available in a short report by senior geophysicist Mitsuru Yamashita.
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deep rapid reconnaissance and detailed follow-up
From near-surface down to any practical drilling depth and beyond, MT allows rapid reconnaissance of areas
as large as tens of square kilometers, while detecting conductive zones to 2000 m and deeper.
Closely spaced stations along lines or nets provide data redundancy, high lateral resolution, and a continuous picture of the subsurface resistivity structure
In a two-pass methodology, station and line spacing are as wide as possible in the first pass to keep cost to a minimum. Once areas of interest have been identified, a second pass with more stations at closer spacing increases resolution. The result is rapid, accurate, and cost-effective
identification of conductive mineralized zones.
rapid, cost-effective mapping of conductive zones
Equipment weighs only 30 kg per site, so it's portable by backpack, ATV, snowmobile, or helicopter, from tundra to jungle, in any season. This logistic simplicity reduces cost and increases productivity
The small footprint and environmentally benign installation make the technique practical almost anywhere
Flexible site location and offline sensitivity allow meaningful profiles to be constructed without the rigid grid of methods
like seismic and IP.
Induction vectors indicate the direction and relative strength of offline conductors and are especially useful where the surface is resistive or frozen
(no electrodes required).
MT/AMT sees through the thick conductive clay
(impenetrable by airborne or other surface techniques) that covers many prospective areas.