Physics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsa43b1758n&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SA43B-1758
Physics
[2427] Ionosphere / Ionosphere/Atmosphere Interactions, [2435] Ionosphere / Ionospheric Disturbances, [2437] Ionosphere / Ionospheric Dynamics
Scientific paper
Ionospheric variations after the 2010 Chile Earthquake were investigated using ground-based GPS receiver data over Chile. The earthquake occurred at 0634UT (0334LT) on February 27, 2010. The magnitude was 8.8. The epicenter located at 35.8S and 72.7W. Around this area, many ground-based GPS receivers are operated by several institutes such as International GNSS Service and Low Latitude Sensor Network. We used more than 80 receivers’ data in order to clarify Total Electron Content (TEC) variations associated the earthquake. Four categories of TEC variations were found associated the earthquake; Category 1. Rapid (~4-5 minutes) enhance, Category 2. Slow (~20 minutes) enhance, Category 3. Depletion, and Category 4. Periodic fluctuation. Properties of each variation were as follows; Category 1: The rapid TEC enhancement occurred ~10 minute after the earthquake. It appeared 400-1,600km north and north-east of the epicenter. It traveled at the speed of 2km/s. Time scale of the enhancement was 4-5 minutes with maximum TEC enhancement of more than 3 TECU. Category 2: The slow TEC enhancement occurred 15 minutes after the earthquake. It appeared 800-2,500km north and north-east of the epicenter. It travelled at the speed of ~700m/s. Time scale of the enhancement was ~20 minutes with maximum TEC enhancement of more than 3 TECU. Category 3: The TEC depletion appeared 10 minutes after the earthquake. It existed 200-900km northeast, southeast, and northwest of the epicenter. The depletion traveled at the speed of ~2km/s. At some stations, TEC depleted more than 1.0TECU. Category 4: The periodic TEC fluctuations appeared ~10 minutes after the earthquake. The fluctuations only appeared 1200-1700km north of the epicenter and ~500km northeast of the epicenter. The period was 3-4 minutes. Maximum duration of the TEC fluctuation was more than one hour. TEC enhancement such as Categories 1 and 2 have been reported by Otsuka et al. 2006. Properties of the reported enhancement are consistent with those of Categories 1 and 2. Both of rapid and slow TEC enhancements were observed at some stations, which locate ~1000km north of the epicenter. It suggests that two types of TEC enhancements may be generated and propagate individually. Acoustic resonance could also contribute to the periodic fluctuation (Category 4). We will show the characteristics of those TEC variations and discuss the generation mechanism in our presentation.
Nishioka Masaya
Otsuka Yoichi
Shiokawa Kazuhiko
No associations
LandOfFree
TEC variations associated with the 2010 Chile Earthquake studied with ground-based GPS data does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with TEC variations associated with the 2010 Chile Earthquake studied with ground-based GPS data, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and TEC variations associated with the 2010 Chile Earthquake studied with ground-based GPS data will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1505836