The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences
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Articles | Volume XLI-B8
Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XLI-B8, 117–120, 2016
https://doi.org/10.5194/isprs-archives-XLI-B8-117-2016
Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XLI-B8, 117–120, 2016
https://doi.org/10.5194/isprs-archives-XLI-B8-117-2016

  22 Jun 2016

22 Jun 2016

NEAR REAL-TIME DETERMINATION OF EARTHQUAKE SOURCE PARAMETERS FOR TSUNAMI EARLY WARNING FROM GEODETIC OBSERVATIONS

Sunanda Manneela1, T. Srinivasa Kumar1, and Shailesh R. Nayak2 Sunanda Manneela et al.
  • 1Indian National Centre for Ocean Information Services, Hyderabad, India
  • 2Ministry of Earth Sciences, Govt. of India, New Delhi, India

Keywords: earthquake, tsunami, ITEWS, GPS, inversion, moment magnitude, tsunami warning, numerical modelling

Abstract. Exemplifying the tsunami source immediately after an earthquake is the most critical component of tsunami early warning, as not every earthquake generates a tsunami. After a major under sea earthquake, it is very important to determine whether or not it has actually triggered the deadly wave. The near real-time observations from near field networks such as strong motion and Global Positioning System (GPS) allows rapid determination of fault geometry. Here we present a complete processing chain of Indian Tsunami Early Warning System (ITEWS), starting from acquisition of geodetic raw data, processing, inversion and simulating the situation as it would be at warning center during any major earthquake. We determine the earthquake moment magnitude and generate the centroid moment tensor solution using a novel approach which are the key elements for tsunami early warning. Though the well established seismic monitoring network, numerical modeling and dissemination system are currently capable to provide tsunami warnings to most of the countries in and around the Indian Ocean, the study highlights the critical role of geodetic observations in determination of tsunami source for high-quality forecasting.