Monitoring volcanoes using seismic noise correlations

Monitoring Volcanoes using Seismic Noise Correlations*

In this paper, we summarize some recent results of measurements of temporal changes of active volcanoes using seismic noise cross-correlations. We first present a novel approach to estimate volcano interior temporal seismic velocity changes. The proposed method allows to measure very small velocity changes (≈ 0.1%) with a time resolution as small as one day. The application of that method to Pi...

Detecting seasonal variations in seismic velocities within Los Angeles basin from correlations of ambient seismic noise

S U M M A R Y We analyse 3 yr of continuous seismic records from broad-band stations of the Caltech Regional Seismic Network (CI) in vicinity of the Los Angeles basin. Using correlations of ambient seismic noise, relative velocity variations in the order of 0.1 per cent can be measured between all interstation pairs. It is the first time that such an extensive study between 861 interstation pai...

Seismic Gradiometry using Ambient Seismic Noise in an Anisotropic Earth

Subsurface modeling of mud volcanoes, using density model and analysis of seismic velocity

Detection of subsurface structures by means of gravity method can be used to determine mass distribution and density contrast of rock units. This distribution could be detected by different geophysical methods, especially gravity method. However, gravity techniques have some drawbacks and can't be always successful in distinguishing subsurface structures. Performance of the gravity technique co...

Influence of the seismic noise characteristics on noise correlations in the Baltic Shield

SUMMARY It has recently been shown that correlations of seismic noise can contain significant information about the Green's function along the station profile. Using an array of 38 temporary broadband stations located in Finland between September 1998 and March 1999, we study the resulting 703 noise correlations to understand how they are influenced by the directivity of the noise field. The la...