(Detection of Electro-Magnetic Emissions Transmitted from Earthquake Regions) is a CNES
launched in 2004
with a 2-year planned lifetime, for developing earthquake prediction
. The satellite measures ionospheric disturbances like ion density
and extremely low frequency (ELF)
changes in the Earth's magnetic field. The satellite is equipped with a segmented Langmuir probe acts as a direction plasma-ion detector. The probe is divided into 7 disc on a sperical tip rod the rod is also a probe. When combined the discs act as a directional ion sensor.
Some researchers claim that the initial results look very promising while others remain skeptical. A correlation of detection of low frequency electromagnetic waves and ionosphere changes with seismic activity around the world was observed. Moreover, a strong signal (increase in ionospheric electron density and decrease in ionospheric electron temperature) was seen on August 29, 2004 while orbiting over southern Japan, just seven days before a 7.1 magnitude earthquake which occurred in that part of Japan on September 5.
A private company has been formed in Palo Alto, California with the goal of promoting earthquake prediction using satellite data and launching similar satellites.