Monitoring Groundwater and Flood Effects on Shallow Seismic Properties in Jakarta, Indonesia

Session: Environmental and Near Surface Seismology: From Glaciers and Rivers to Engineered Structures and Beyond
Type: Oral
Date: 4/29/2020
Time: 11:45 AM
Room: 110 + 140
Description: 

Jakarta exhibits among the fastest subsidence rates on Earth with up to 20 cm/year due to unregulated groundwater extraction of a ~200m deep confined aquifer. Due to the extensive subsidence, Jakarta is also exposed to dramatic flooding with river backflow and rising sea levels. We use a 6-month temporary deployment of broadband seismometers in 2013-2014 to explore the temporal evolution of seismic velocity. We use both inter-station and single-station correlation functions in all components of the correlation tensor to map the changes at various spatial scales. We correlate our results with remote sensing observation of land subsidence and localized measurement and predictions of ground water levels. We also explore the change in spectral content of the correlation function, discuss these effects in terms of changes in local attenuation and the implication in terms of long term high-frequency ground motion prediction.

Presenting Author: Marine A. Denolle

Authors