| Title | 3D-ambient noise Rayleigh wave tomography of Snæfellsjökull volcano, Iceland |
| Publication Type | Journal Article |
| Year of Publication | 2016 |
| Authors | Obermann, A, Lupi, M, Mordret, A, Jakobsdóttir, SS, Miller, SA |
| Journal | Journal of Volcanology and Geothermal Research |
| Volume | 317 |
| Pagination | 42 - 52 |
| Date Published | Jan-05-2016 |
| ISSN | 03770273 |
| Abstract | FromMay to September 2013, 21 seismic stationswere deployed around the Snæfellsjökull volcano, Iceland.We
cross-correlate the five months of seismic noise and measure the Rayleighwave group velocity dispersion curves
to gain more information about the geological structure of the Snæfellsjökull volcano. In particular, we investigate
the occurrence of seismic wave anomalies in the first 6 km of crust. We regionalize the group velocity dispersion
curves into 2-D velocity maps between 0.9 and 4.8 s. With a neighborhood algorithm we then locally
invert the velocity maps to obtain accurate shear-velocity models down to 6 km depth. Our study highlights
three seismic wave anomalies. The deepest, located between approximately 3.3 and 5.5 km depth, is a high velocity
anomaly, possibly representing a solidified magma chamber. The second anomaly is also a high velocity
anomaly east of the central volcano that starts at the surface and reaches approximately 2.5 kmdepth. It may represent
a gabbroic intrusion or a dense swarm of inclined magmatic sheets (similar to the dike swarms found in
the ophiolites), typical of Icelandic volcanic systems. The third anomaly is a low velocity anomaly extending up
to 1.5 km depth. This anomaly, located directly belowthe volcanic edifice, may be interpreted either as a shallow
magmatic reservoir (typical of Icelandic central volcanoes), or alternatively as a shallow hydrothermal system
developed above the cooling magmatic reservoir. |
| URL | http://linkinghub.elsevier.com/retrieve/pii/S0377027316000573http://api.elsevier.com/content/article/PII:S0377027316000573?httpAccept=text/xmlhttp://api.elsevier.com/content/article/PII:S0377027316000573?httpAccept=text/plain |
| DOI | 10.1016/j.jvolgeores.2016.02.013 |
| Short Title | Journal of Volcanology and Geothermal Research |
