Detection of 12th September 2007 Sumatra Tsunami at Goa and Kavaratti Island

R G Prabhudesai,Suryakant Tengali,Prakash Mehra,Antony Joseph,Yogesh Agarvadekar,Vijaykumar Vijaykumar

doi:10.1109/oceanskobe.2008.4530909

R G Prabhudesai, Suryakant Tengali + Show 4 more

https://doi.org/10.1109/oceanskobe.2008.4530909

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Publication Date: Apr 1, 2008

Citations: 2

Affiliation: National Institute of Oceanography

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Subsurface pressure based real-time reporting and Internet-accessible coastal sea-level stations designed and established by the Indian National Institute of Oceanography (NIO) reported the 12 th September 2007 Sumatra tsunami waves from Goa (west coast of India) and Kavaratti Island (Lakshadweep archipelago) in the Arabian Sea. The sea-level stations sampled and transmitted the subsurface pressure data to the Internet server (IS) via GPRS cellular network at 5-minutes intervals. The subsurface pressure data received at the IS are converted to sea-level data and then the observed, predicted, and residual sea-levels in graphical format are displayed in real time on Internet. The graphical display from our sea-level station at Goa provided an indication of the presence of a distinct signal of tsunami periodicity. Spectral analysis of this data clearly reveals a dominant period of about 43 minutes. The tsunami wave arrived at the Goa site at ~00 hr: 45 minutes 1 ST on 13 September 2007, after traveling for ~8 hr from the tsunami source region (Sumatra). The first wave was negative (trough). The observed and the maximum trough-to-crest wave height was 29 cm. The tsunami wave which arrived at Kavarathi Island at 22 hr 1 ST on 12 th September 2007 was less prominent (trough-to-crest wave height ~5 cm) relative to that observed in Goa. Thus, tsunami signal at Goa was ~ 6-fold larger than that at Kavarastti Island. Arrival of a detectably large tsunami signal first at Kavaratti Island and 2 hr: 45 minutes later at the shallower Goa coastal region of the mainland shows the importance of having real-time monitoring and Internet-accessible sea-level stations on India's island locations for effective tsunami warning purposes.

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