29 September 2017 The upper atmosphere layer height changes as a precursor of the Padang earthquake on 30 September 2009
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Abstract
This research investigated the potential of the upper atmosphere layer height changes as precursor of the Padang Earthquake on 30 September 2009. We analyzed the occurrence of atmospheric gravity wave (AGW) in all-sky imager (ASI) images and h’F in ionosonde mounted on Kototabang (0.2°S, 100.3°E, -10.4° magnetic latitude) Indonesia from seven days before and after the earthquake and found that there was an unusual evening in h’F variation on 24 and 29 September 2009. A positive h’F deviation on 24 and 29 September 2009 are with a maximum value of 42 and 31.5. For both these dates, the maximum h’F value reached 234 km and 261 km at 00:30 LT and 20:30 LT with the median value of 192 km and 229.5 km, respectively. The increase in h’F on 24 September 2009 before the midnight was caused by encouragement from AGW observed at a wavelength of OH bands (~86 km) that happened a few minutes earlier. While the increase in h’F on 29 September 2009, suspected to be caused by the emergence of the AGW, though it cannot be proven because ASI does not operate due to rainy weather over Kototabang. For Dst index during the month of September 2009, there is nothing worth under -50 nT, this means a change of altitude h’F six and one days before the earthquake is not caused by the influence of magnetic storm but caused by AGW resulting from the epicenter.
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Ednofri Ednofri, Ednofri Ednofri, Falin Wu, Falin Wu, Wasiu Akande Ahmed, Wasiu Akande Ahmed, Yan Zhao, Yan Zhao, } "The upper atmosphere layer height changes as a precursor of the Padang earthquake on 30 September 2009", Proc. SPIE 10425, Optics in Atmospheric Propagation and Adaptive Systems XX, 104250I (29 September 2017); doi: 10.1117/12.2278319; https://doi.org/10.1117/12.2278319
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