Earthquake Precursory Analysis

Study of following earthquake precursors

  • Critical frequency of ionospheric F2 layer
  • Infrasonic precursors
  • Seismological precursors
  • Thermal Infrared (TIR) and Outgoing Longwave Radiation (OLR)
  • Geo-Magnetic field variations
  • Soil radon exhalation

Continuous radon monitoring using RTM 2200

Schematic flowchart for radon monitoring as an earthquake precursor

Ionospheric Total Electron Content

Dual frequency GNSS Antenna receives the signals from GPS and GLONASS satellites revolving around the earth at the height of about 20,200 km. Each satellite continuously broadcasts a signal on two carrier frequencies f1=1575.42 MHz and f2=1227.76 MHz. The propagation delay is experienced by the satellite signals in the ionosphere. The differential time delay between f1 and f2 is used to calculate the Total electron content (TEC) along the ray path from satellite to receiver on the ground.

Sky plot of GPS and GLONASS Satellites

Atmospheric Vertical Electric Field

Subtle variations in atmospheric electric field observed during fair weather conditions may be caused by the preparation of a significant earthquake. Thus atmospheric electric field is studied as a potential earthquake precursor.

Zebra electric Field Mill Sensors installed at remote sites to measure the Vertical Electric Field (VEF) variations, a short term earthquake precursor

CA | NCP Mail | Library | Online