Monitoring Saturation Changes with Ambient Seismic Noise and Gravimetry in a Karst Environment

Monitoring and Locating Changes in the Elastic Properties of the Crust with Ambient Seismic Noise Interferometry

In highly heterogeneous media waves do not propagate ballistically. They interact several times with the heterogeneities of the medium and enter the multiple scattering regime. In this regime, classical imaging techniques based on direct or singly scattered waves fail. This is typically the case in fault zones and volcanoes, two highly heterogeneous structures that are of great interest for man...

Monitoring southwest Greenland’s ice sheet melt with ambient seismic noise

The Greenland ice sheet presently accounts for ~70% of global ice sheet mass loss. Because this mass loss is associated with sea-level rise at a rate of 0.7 mm/year, the development of improved monitoring techniques to observe ongoing changes in ice sheet mass balance is of paramount concern. Spaceborne mass balance techniques are commonly used; however, they are inadequate for many purposes be...

Seismic Ambient Noise and Its Applicability to Monitor Cryospheric Environment

Monitoring transient changes within overpressured regions of subduction zones using ambient seismic noise

In subduction zones, elevated pore fluid pressure, generally linked to metamorphic dehydration reactions, has a profound influence on the mechanical behavior of the plate interface and forearc crust through its control on effective stress. We use seismic noise-based monitoring to characterize seismic velocity variations following the 2012 Nicoya Peninsula, Costa Rica earthquake [M w (moment mag...

Event-driven Seismic Interferometry with Ambient Seismic Noise

SUMMARY By cross-correlating recordings of ambient seismic noise, one can retrieve the subsurface reflection response. The quality of the retrieved reflections would depend on the qualities of the ambient noise. In a previous study, we cross-correlated ambient-noise data recorded in a desert area in North Africa and showed that we retrieved reflections. This was done assuming that body-wave noi...