000			04196nas a2200433 a 4500
005			20260817162511.0
008			260115s20229999th u ms t 000 eng d
035			_a.b12470624
099		9	_aAIT Diss. no.RS-22-01
100	1		_aPrapas Thammaboribal
245	1	0	_aAnalysis of vertical total electron content (VTEC) from different IGS products and VTEC anomalies for the detection of earthquake precursor
260			_aPathum Thani, Thailand : _bAsian Institute of Technology, _c2022
300			_a165 leaves : _bill. (some col.)+ _e1 online resource
490	1		_aDissertation ; _vno. RS-22-01
500			_aA dissertation submitted in partial fulfillment of the requirements for the degree of Doctor of Engineering in Remote Sensing and Geographic Information Systems
502			_aThesis (Ph.D.) - Asian Institute of Technology, 2022
520			_aThe main objective of this study is the development of seismo-ionospheric anomaly detection technique by applying the average of diurnal vertical total electron content (AVTEC) as well as the standard deviation of diurnal vertical total electron content (SVTEC) instead of the conventional techniques as applying background window for detecting the VTEC anomaly. In this study, 38 earthquakes vary from light earthquakes (M4<M<M5) to great earthquakes (M>8) were selected as case studies. The epicenters of the earthquakes were located in low latitude and middle latitude regions.To investigate the influence of geography on the VTEC anomaly appearance, the earthquakes were also characterized into inland and submarine earthquakes. The results reveal that the ionospheric anomaly cannot be detected at all when the earthquake moment magnitude is lower than 5 (light earthquakes), but the moderate earthquakes and strong earthquakes, the anomalies were significantly detected in low latitude region. In case of a magnitude greater than 7, the anomalies were detected one up to six days prior to the earthquake occurrence. The anomalies detected from inland earthquake cases give the same characteristic of AVTEC and SVTEC distribution which the values of AVTEC and SVTEC decrease proportional to the distance rom the anomalous zone, the anomalous zone usually occurs within the earthquake preparation zone.The ionospheric anomalies of major and great earthquake cases also reveal that the anomaly can be detected both in low latitude and middle latitude but the appearance of the anomaly is more significant in the low latitude region because the ionosphere in the mid latitude in this study is influenced by the crest of onospheric variation n the eguatorial ionization anomaly (EIA). Finally, the anomalous days detected from AVTEC and SVTEC were consistent with previous studies, thus, this novel anomaly detection technique is a promising approach for the further work of the ionospheric disturbance prior 19 earthquake occurrence study.
650		0	_aIonospheric electron density _xDetection _xTechnique
650		0	_aEarthquake prediction
700	1		_aTripathi, Nitin Kumar, _eChairperson
700	1		_aPal, Indrajit, _eExamination Committee
700	0		_aSarawut Ninssawat, _eExamination Committee
710	2		_aRoyal Thai Government, _eScholarship Donor
710	2		_aAIT Fellowship, _eScholarship Donor
810	2		_aAsian Institute of Technology. _tDissertation ; _vno. RS-22-01
856			_3Full-Text _uhttp://203.159.5.9/ait-thesis/detail.php?q=B23584
907			_a.b12470624 _bmnarc _ca
902			_a260227
998			_b0 _c260223 _dm _ea _fa _g0
945			_lmnarc
945			_lmnait
945			_lmnait
942			_c40
942			_c20
909			_aBarcode : 30050120422299 _bCREATED : 2026-01-15 _cRECORD # : i13566568 _dLPATRON : 0 _eLCHKIN : - _f# RENEWALS : 0 _g# OVERDUE : 0 _hIUSE3 : 0 _iTOT CHKOUT : 0 _jTOT RENEW : 0
909			_aBarcode : 30050120421739 _bCREATED : 2026-01-26 _cRECORD # : i13568735 _dLPATRON : 0 _eLCHKIN : - _f# RENEWALS : 0 _g# OVERDUE : 0 _hIUSE3 : 0 _iTOT CHKOUT : 0 _jTOT RENEW : 0
909			_aBarcode : 30050120418073 _bCREATED : 2026-01-26 _cRECORD # : i13568747 _dLPATRON : 0 _eLCHKIN : - _f# RENEWALS : 0 _g# OVERDUE : 0 _hIUSE3 : 0 _iTOT CHKOUT : 0 _jTOT RENEW : 0
999			_c5229 _d5229