D. Srinagesh, Prantik Mandal, R Vijaya Raghavan, Satish Saha, M Sekhar, A N S Sarma, G Suresh, B Naresh, D Srinivas, Aarti Devi and V. M. Tiwari*

1. Data Description

The data set contains seismic waveforms recorded by the 17 broadband stations of Uttarakhand network operated by CSIR-NGRI (Srinagesh et al., 2019) for a period of 3 hours each, covering the 7 Feb 2021 Uttarakhand landslide event (Rao et al., 2021). The stations are equipped with 24-bit Reftek Digital acquisition system 120 sec broadband Reftek sensor with a sampling rate 100 samples per second (sps). The data was time tagged using GPS receivers at every station. This network was installed under the Focussed Basic Research Project MLP-FBR-005 (R & D Project) funded by the Council of Scientific and Industrial Research (Ministry of Science and Technology, Government of India) with the basic objective of understanding the earthquake Hazard of this region and also, mapping the crust mantle structure. The duration of this project is for 3 years (2020-2021). An attempt has been made by Cook et al., (2021) to demonstrate the robustness of the seismological detection and tracking of 7 FEB 2021 landslide induced flood that occurred in Uttarakhand, India.

1.1. Sampling method

The broadband stations are equipped with 24-bit Reftek recorder and 120 sec broadband Reftek sensor. The data were sampled at 100 samples per second (sps).

1.2. Analytical procedure

The network is serviced every 3 months and the data is manually brought back to CSIR-NGRI and processed for its quality and further, processed for meeting the project objectives.

1.3. Data processing

The data from the stations listed in Table 1 were initially converted from Reftek to SAC format and then subjected to instrument correction using the Seismic Analysis Code (SAC) (Goldstein et al., 2003).

2. File description

Each data file in the SAC DATA folder is in ‘*.SAC’ format containing the single seismic trace of duration one hour. For each station, there are 9 files (3 components * 3 hours) covering the time period 07-02-2021 04:00:00 UTC to 07-02-2021 06:59:59 UTC.

Each file was named in the convention STN. JDY.HH.MM.SS.CMP.SAC

• STN: Station name (acronym)
• JDY: Julian day of the year
• HH.MM.SS: Starting time (HH: Hour MM: Minute SS: Second)
• CMP: Component of the data (BHZ/BHN/BHE accordingly for Vertical/North/East) components.

Each SAC file contains the header information related to number of samples, sampling rate, starting time (Year, Month, Day, Hour, Minute, Second), Station name, Latitude, Longitude, Elevation etc., following the standard SAC header format.

3. Citation

When using the data please cite:

D. Srinagesh, Prantik Mandal, R Vijaya Raghavan, Satish Saha, M. Sekhar, A N S Sarma , G. Suresh, B Naresh, D Srinivas, Aarti Devi and V. M. Tiwari. 2021. Seismic Waveform data of 7 February 2021 Uttarakhand rockslide induced flood recorded by CSIR-NGRI. https://doi.org/10.13140/RG.2.2.11461.17122/3

The data are supplementary material to:

Cook, K.L., Rekapalli, R., Dietze, M., Pilz, M., Cesca, S., Rao, N.P., Srinagesh, D., Paul, H., Metz, M., Mandal, P., Suresh, G., Cotton, F., Tiwari, V. M., Hovius , N. (2021): Detection and Early Warning of Catastrophic Flow Events Using Regional Seismic Networks (Under review)

4. References

Cook, K.L., Rekapalli, R., Dietze, M., Pilz, M., Cesca, S., Rao, N.P., Srinagesh, D., Paul, H., Metz, M., Mandal, P., Suresh, G., Cotton, F., Tiwari, V. M., Hovius , N. (2021): Detection and potential early warning of catastrophic flow events with regional seismic networks. Science 374,87-92 https://doi.org/10.1126/science.abj1227

Goldstein, P., D. Dodge, M. Firpo, Lee Minner (2003): SAC2000: Signal processing and analysis tools for seismologists and engineers. The IASPEI International Handbook of Earthquake and Engineering Seismology”, Edited by WHK Lee, H. Kanamori, P.C. Jennings, and C. Kisslinger, Academic Press, London. https://doi.org/10.1016/S0074-6142(03)80284-X

Rao, N. P., Rekapalli, R., Srinagesh, D., Tiwari, V. M., Hovius, N., Cook, K. L., & Dietze, M. (2021). Seismological rockslide warnings in the Himalaya. Science, 372(6539), 247-247. https://doi.org/10.1126/science.abi4819

Srinagesh, D., Mandal, P., Raghavan, R.V., Gupta, S., Suresh, G., Srinivas, D., Saha, S., M. 30 Sekhar, K. Sivaram, S. Kumar, P.S. Raju, A.N.S. Sarma, Y.V.V.S.B. Murthy, N.K. Borah, B. Naresh, B.N.V. Prasad, V.M. Tiwari, Digital seismic network: to map Himalayan orogen and seismic hazard. Current Science 116(4), 518-519 (2019). https://wwwops.currentscience.ac.in/Volumes/116/04/0518.pdf

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