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Prasanna V.,Climate Center | Subere J.,Nagoya University | Das D.K.,Regional Integrated Multi Hazard Early Warning System RIMES | Govindarajan S.,Regional Integrated Multi Hazard Early Warning System RIMES | Yasunari T.,Nagoya University
Meteorological Applications | Year: 2014

The India Meteorological Department (IMD) gridded rainfall dataset, the 47 Bangladesh gauge rainfall observations and the Tropical Rainfall Measuring Mission (TRMM) 3B42V6 satellite data are used in the present analysis. The nearest neighbour interpolation scheme is used, wherein the interpolated values are computed from a weighted sum of observations. The Bangladesh daily gauge measured rainfall is interpolated into regular grids of 0.5° × 0.5° resolution every day from January 1988 to December 2007 and appended with the daily gridded dataset of the IMD over the Indian region. A similar resolution dataset of 0.5° × 0.5° for the TRMM-3B42V6 data from January 1998 to December 2007 is created from the original data of 0.25° × 0.25° resolution. To produce a merged rainfall product, all the gridded datasets are merged. The merging of datasets is done in such a way as to include the highest rainfall at each grid point from the three products. Based on the three available sets of daily observations (IMD dataset (1° × 1°), TRMM-3B42 (0.25° × 0.25°) and 46 daily station observations over Bangladesh), a dataset of 0.5° × 0.5° resolution on a daily scale is generated. The focus of this study is to compare the TRMM-3B42V6 rainfall data over the Ganga, Brahmaputra and Meghna (GBM) domain with observed point gauge data, and assess the possibility of using them for application in real time flood forecasting as well as to serve as a comparison tool for the baseline simulation of high resolution atmospheric models aimed at flood forecasting and climate change projections. © 2012 Royal Meteorological Society.

Ornthammarath T.,Regional Integrated Multi Hazard Early Warning System RIMES | Ornthammarath T.,Asian Institute of Technology
Bulletin of Earthquake Engineering | Year: 2013

This study aims to investigate a Mw 6. 8 earthquake that occurred in Myanmar on 24 March 2011. The epicenter of this earthquake struck very close to the Tarlay town which is located near the border of Myanmar, Lao People's Democratic Republic (PDR), and Thailand. In addition, this shallow left-lateral strike-slip earthquake occurred on Nam Ma fault which is previously identified as an active fault. Based on instrumental earthquake catalogue, Nam Ma fault did not produce any earthquake greater than magnitude 6 for at least 100 years. So the 24 March 2011 earthquake is essentially filling the gap of relatively short instrumental earthquake catalogue in this region. The strong ground motion from this event has been recorded in Thailand with the highest peak ground acceleration (PGA) of 0. 20 g at 28 km distance at Mae Sai town. Comparison between observed strong motion and global empirical equation had been provided. Over the distance range for which the model is applicable, they are in fair agreement. On the other hand, at long distance, the large positive and negative residuals suggest that a change in slope in the attenuation is not reflected in these relations. Lastly a seismological aspect of strong ground motion at Mae Sai had been given. © 2012 Springer Science+Business Media Dordrecht.

Lai C.G.,University of Pavia | Lai C.G.,European Center for Training and Research in Earthquake Engineering | Menon A.,Indian Institute of Technology Madras | Ornthammarath T.,Regional Integrated Multi Hazard Early Warning System RIMES
Natural Hazards | Year: 2012

A probabilistic seismic hazard assessment at Kancheepuram in Southern India was carried out with the scope of defining the seismic input for the vulnerability assessment of historical and monumental structures at the site, in terms of horizontal Uniform Hazard Spectra and a suite of spectrum-compatible natural accelerograms to perform time-history analysis. The standard Cornell-McGuire and a zone-free approach have been used for hazard computations after the compilation of a composite earthquake catalogue for Kancheepuram. Epistemic uncertainty in the seismic hazard was addressed within a logic-tree framework. Deaggregation of the seismic hazard for the peak ground acceleration shows low seismicity at Kancheepuram controlled by weak-to-moderate earthquakes with sources located at short distances from the archaeological site. Suites of natural accelerograms recorded on rock have been selected by imposing a custom-defined compatibility criterion with the probabilistic spectra. The site of Kancheepuram is characterized by a seismicity controlled by weak-to-moderate earthquakes with sources at short distances from the site, the PGA expected for 475- and 2,475-year return period are, respectively, 0. 075 and 0. 132 g. The Indian code-defined spectra (DBE and MCE) tend to underestimate spectral ordinates at low periods. On the other hand, the PGA are comparable and the spectral ordinates for longer periods from the probabilistic study are significantly lower. © 2012 Springer Science+Business Media B.V.

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