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Contribution of Smart Cables to Earthquake and Tsunami Early Warning in the Sumatra and Java Regions

Session: Advances in the Science and Observation of Tsunamis [Poster]

Type: Poster

Date: 4/22/2021

Presentation Time: 03:45 PM Pacific

Description: 

SMART (Science Monitoring And Reliable Telecommunications) cables as a potential next generation of marine sensors with both societal and scientific applications are powerful solutions to monitoring natural hazards such as earthquakes and tsunamis. In this framework and considering the high societal risk and spatial and financial scales of these hazards in Indonesia, we propose the deployment of such a network in eastern Indian Ocean. We present results from a series of exploratory numerical experiments regarding the deployment of a linear array of SMART stations seaward of the trench in the Sumatra-Java region. We use a number of static earthquake rupture scenarios (8.5<M_w<9.3) at various locations along the trench and calculate tsunami propagation using hydrodynamic simulations. Through these experiments we show that the proposed array improves the detection of earthquake tsunamis up to several hours compared to the existing DART system in the Indian Ocean. Similarly, we simulate the tsunamis from a large number of submarine landslide scenarios in the region and show that the SMART system can provide invaluable information for use in early warning against landslide tsunamis. We also calculate seismic phase arrival times from our source scenarios at both the existing seismic stations and our proposed SMART cables. Our results show that inclusion of such a SMART array can expedite the detection of seismic events in the region by siginifcantly reducing event-to-station distances and therefore seismic arrival times. Also, by means of closing the >180° southern and western azimuthal gaps along the entire span of Sumatra and Java, the proposed array would drastically decrease inaccuracies in the earthquake location process in the region.

Presenting Author: Amir Salaree

Student Presenter: No

Authors