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########### Global map of subsea telecommunication cables ######
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## A. INCLUDED ITEMS:

1. subsea_telecom_cables.dat
	Geographic coordinates of nominal locations of subsea 
	telecom cables. This is a two-column ASCII file with 
	(longitude,latitude) pairs, for all cable segments.
	The file is readable with most mapping programs such 
	as GMT (Generic Mapping Tools; Wessel et al, 2013).
	'>' lines separate cable segments and branches.

2. subsea_telecom_cables.mp4	
	The movie shows global distribution of subsea telecom 
	cables, interpolated to 1 degree. The map is color-coded 
	according to population (NASA-SEDAC); scale bar shows 
	population per square km. Visualization is done using GMT.

3. SMART.xy
	Geographic coordinates of our proposed SMART* array.

4. README.txt
	Description of contents (this file).


* SMART (Scientific Monitoring And Reliable Telecommunications) 
  networks are telecommunication cables equipped with scientific 
  sensors such as accelerometer, pressure sensors, etc.

## B. DESCRIPTION:

This material accompanies a set of exploratory numerical experiments based 
on ocean bottom pressure and seismic data from a simulated linear array 
of SMART (Scientific Monitoring And Reliable Telecommunication) cable 
stations off the trench in the Sumatra-Java region. We use a set of 
earthquake rupture as well as submarine landslide scenarios to calculate 
tsunami propagation via hydrodynamic simulations. We also investigate the 
contribution of SMART stations to improvement of earthquake early warning 
by calculating the arrival times of seismic phases. Existing telecom cables 
can also contribute to the SMART network, if they are equipped with scientific 
sensors and repeaters. In this study we use the MOST (Method of Splitting 
Tsunami; Titov et al, 2016) to simulate tsunamis, and the TauP toolkit 
(Crotwell et al, 1999) to calculate seismic arrival times.


## C. REFERENCE:

- Crotwell, H.P., Owens, T.J. and Ritsema, J., 1999. The TauP Toolkit: 
Flexible seismic travel-time and ray-path utilities. Seismol. Res. Lett.,
70(2), pp.154-160, https://doi.org/10.1785/gssrl.70.2.154

- NASA-SEDAC, 2018. Documentation for the Gridded Population of the 
World, version 4 (GPWv4), Revision 11 Data Sets, Palisades NY: NASA 
Socioeconomic Data and Applications Center (SEDAC), 
https://sedac.ciesin.columbia.edu/data/collection/gpw-v4/documentation,
accessed 02 Dec 2020.

- Titov, V., Kânoğlu, U. and Synolakis, C.E., 2016, Development of MOST 
for real-time tsunami forecasting. J Waterw Port Coast Ocean Eng 
142:03116004-1–03116004-16, https://doi.org/10.1061/(ASCE)WW.1943-5460.0000357

- Wessel, P., Smith, W.H., Scharroo, R., Luis, J. and Wobbe, F., 2013. 
Generic Mapping Tools: Improved version released. Eos, Transactions 
American Geophysical Union, 94(45), pp.409-410, 
https://doi.org/10.1002/2013EO450001

## D. FUNDING

This study was supported by grants from National Science Foundation 
(PREEVENTS geosciences directorate No. 1663769) and NASA JPL (Award NNN13D462T).