The current status of ionospheric precursor studies associated with large earthquakes (EQ) is summarized in this report. It a joint endeavor the "Ionosphere Precursor Study Task Group," which was formed support Mitsubishi Foundation 2014–2015. group promotes study ionosphere precursors (IP) to EQs and aims prepare for future EQ dedicated satellite constellation, essential obtain global morphology IPs hence demonstrate whether can be used short-term predictions. Following review recent IP...

The paper attempts to identify ionospheric parameters in association with earthquake at anomaly crest station through VHF Radio Beacon data and ground based ionosonde measurements while the Total Electron Content(TEC) from RB observations are mainly on taken over Guwahati (26.2°N, 91.75° E), foF2 used analysis were collected Ahmadabad (23.01°N, 72.36°E). describes methods techniques adopted examine modifications these if any, due preparatory processes equatorial stations. mechanism of...

A dual-frequency global positioning system (GPS) receiving set-up at Guwahati (26° 10′ N, 91° 45′ E), has been in operation for the last year and a half, providing total electron content (TEC) data as input understanding pre-earthquake contributions to low-latitude atmospheric dynamics. The major China earthquake of 12 May 2008, with magnitude 8.0 an epicentre 31° 24′ 103° 58′ E is rare event facilitate extracting features on TEC data, hence perturbations. This paper begins brief discussion...

Total electron content (TEC) data, obtained from satellites, are used in the search for imprints identifying probability factor of an impending earthquake. Extraction earthquake induced signature is done mainly day-to-day variations TEC peak (TECpeak.). The use a single parameter such as TECpeak not always enough to formulate pointer. paper therefore focuses on need introduce other markers shape profile and utilize any modification caused by identify precursors. An automatic pattern matching...

The processes leading to the growth and inhibition of equatorial anomaly before major earthquake (EQ) were viewed in this paper by examining global Total Electron Content (TEC) that contoured over longitude sectors covering Africa Pacific, association with EQ events Japan (M = 9) occurred at 135°E 145°E 35°N 40°N, on March 9 11, 2011 Indonesia 8.6) took place 2.311°N, 93°E, April 2012. focuses development abnormal increase density night sector around—10° latitude zone prior two events,...

Abstract In the light of newly found applications for very low frequency (VLF) (3–30 kHz) measurements in prediction earthquakes and detection lightning discharges gamma ray bursts, there has been a revival interest study VLF propagation earth-ionosphere waveguide. The characteristics radiowaves waveguide critically depend upon lower ionospheric ionization, which determines conductivity profile upper boundary this context, it is potentially worthwhile to revisit mode analysis compute...

The paper presents an analysis of variations in Total Electron Content (TEC) observed through Global Positioning System (GPS) at Guwahati (26?10'N, 91?45'E), relation to the Japan Earthquakes (EQs) March 9 and 11, 2011. For this purpose, azimuthal positions trajectories abnormally increased number satellites epicentre location appearing into Field Of View (FOV) GPS antenna consequent pseudo enhancement TEC are taken as inputs. discusses how results could provide warning alarms two...

Abstract A synoptic survey of Sudden Phase Anomalies (SPAs) observed in the phase variation measurements 16 kHz VLF transmissions from Rugby (England) made at Visakhapatnam (India) has been carried out. These Ionospheric Disturbances caused during solar flares are examined relation to flare time enhancements X-ray radiation fluxes. It is found that nearly 81% SPAs recorded have accompanying and 80% cases Hα microwave bursts also occur concurrently. Using SPA magnitudes flux values, threshold...

Total Electron Content (TEC) data from GPS are now used as tools for identifying an impending earthquake.The extraction of earthquake induced features this parameter needs elaborate processing because it involves filtration with respect to disturbed day variations, contribution multi path effects and also normal day-to-day fluctuations even during quiet days.In paper we introduce, a peak detection algorithm, automatic pattern matching approach artificial neural network generated TEC record...

<p>The role of orographic factors in modifying atmospheric dynamics on the background an impending earthquake (EQ) that might lead to propagation a signal beyond Line Of Sight (LOS) is examined paper. The analysis based data anomalous reception VHF FM-signal at Gauhati University (GU, 26.15°N, 91.66°E), station located sub Himalayan terrain. records show their appearance are associated closely with events M >5.0, phenomenon identified as EQ precursor. To identify sources such...

The application of Electromagnetic methods in the research field EQ precursor study with aims identifying signature an impending and its epicenter, needs new approaches techniques, because even available volume work reports on these aspects, problem remains still a challenging one.The paper addresses such aspects case Nepal April , 2015 (epicentre at 28.266N 84.463 E ),of magnitude M= 7.9, by examining through analysis global Total Electron content (TEC) data for detection precursive anomaly...