IASPEI - Picture Gallery

25.01.2015 Views
IUGG XXIV General Assembly July 2-13, 2007 Perugia, Italy (S) - IASPEI - International Association of Seismology and Physics of the Earth's Interior JSS010 Poster presentation 2085 Spatial distribution of ionospheric GPS-TEC and NmF2 disturbances prior to the 1999 Chi-Chi and Chia-Yi Earthquakes Mr. Masahide Nishihashi Graduate Course of Science Chiba University IASPEI Hau-Kun Jhuang, Katsumi Hattori, Jann-Yenq Liu Many anomalous electromagnetic phenomena possibly associated with large earthquakes have been reported. Recently, scientists found an apparent reduction in GPS-TEC within 1 - 5 days prior to beyond M6.0 earthquakes in Taiwan. However, those studies did not match simultaneous data sets of other sites to confirm the observed ionospheric anomalies are related to local earthquakes. In this study, we retrieved GPS-TEC data sets, routinely published in the global ionosphere maps (GIM). Simultaneous data of ionosonde records and GPS-TEC data sets of various locations such as Taiwan and Japan were examined to check whether the anomalies observed in Taiwan during the 1999 Chi-Chi earthquake (Mw7.6) and Chia-Yi earthquake (M6.4) episodes are local or global effects. The result shows that the anomalies in Taiwan three days before the Chi-Chi earthquake (18 September), and one and three days before the Chia-Yi earthquake (19 and 21 October) are local phenomena. It means that the ionosphericdisturbed areas were localized around Taiwan, and did not spread all the way to Tokyo in Japan. We conclude that the disturbed areas are at least less than about 2200km in radius and may be much smaller. Keywords: gps tec, nmf2, taiwan earthquakes

IUGG XXIV General Assembly July 2-13, 2007 Perugia, Italy (S) - IASPEI - International Association of Seismology and Physics of the Earth's Interior JSS010 Poster presentation 2086 Joint Satellite and Ground Based EM observation and Search for Earthquake Precursors Dr. Dimitar Ouzounov WG EMSEV EMSEV IAGA Katsumi Hattori, Sergey Pulinets, Masashi Kamogawa, Masahide Nishihashi, Michel Parrot, J.Y. Liu Previous studies have shown that there were precursory electromagnetic signals associated with several recent earthquakes observed on the ground and space. Goal of this work is to merge our new approach of recording and analyzing multi-sensor satellite and ground data to our studies of pre-, co- and postseismic signals.Recent advances in solid earth sciences, GPS/TEC and remote sensing capabilities give us assurance that the scientific understanding and data availability are appropriate at this time to initiate this joint search for the possible earthquake precursors.Our approach is based on data fusion of satellite data obtained from thermal infrared observations from Terra, Aqua, GOES, POES andspace plasma parameters variations from DEMETER, simultaneously with ground based multi parameter continuous measurements ofGPS/TEC, ion concentration, Rn, atmospheric electrical field, magnetic array and corona probe from Japan (Iyogatake station,Chiba University) and Taiwan (NCU).We use existing satellite sensors and ground observations and the physical link between both measurements are given by Lithosphere-Atmosphere-Ionosphere coupling (LAIC) model. This mechanism is a coupling between the boundary layer of atmosphere and the ionosphere due to increased tectonic activity before strong earthquakes. The simultaneous co-existence of several mechanisms manifesting this coupling enhances the possibility of revealing and tracking future EM seismogenic signals much easier and more reliably. Our first results show that is very unlikely that a single existing method (magnetic field, electric field, thermal infrared (TIR), Surface Latent Heat Flux SLHF, and GPS/TEC) can provide a successful solution for monitoring pre-earthquake phenomena on the global scale. However, simultaneous satellite and ground measurements as an integrated web should provide the necessary information by combing the information provided by multiple sensing sources, both on the ground and from space. The significance of joined satellite and ground based EM precursor search was defined thought analyzing most recent major earthquakes (M>5.5, H

Page 1 and 2: IASPEI INTERNATIONAL ASSOCIATION OF

Page 3 and 4: IUGG XXIV General Assembly July 2-1




































































































































































































Page 395: IUGG XXIV General Assembly July 2-1





















































































































































































Page 759: Published and Distributed by USMA 2

iaspei

tsunami

seismic

earthquake

physics

seismology

assembly

iugg

perugia

xxiv

IASPEI - Picture Gallery

IASPEI - Picture Gallery ... View more IASPEI - Picture Gallery

Delete template?

Save as template ?

IASPEI - Picture Gallery IASPEI - Picture Gallery