\nEDM measurements at Augustine began in 1986, with\u00a0campaign GPS surveys conducted in the early 1990s and 2000, and 5 continuous GPS stations established in 2004 by PBO. Campaign GPS\u00a0data\u00a0suggest subsidence between\u00a01988 and 2000 of\u00a0<5 mm\/yr, consistent with deflation of a source < a few km beneath the volcano\u00a0summit. The continuous\u00a0GPS network then suggest uplift of 2 mm\/month between June 2005 to January 2006 resulting from a shallow source.\u00a0SBAS InSAR measurements between 1992 and 2005 also indicate steady, wholescale uplift of the volcano\u00a0by 2\u20138 cm. This pre-eruptive deformation is modelled using two Mogi sources beneath the summit area. The shallower source (1.7 \u2013 3.8 km depth)\u00a0contracted at a rate of 0.2 x 10^6 m\u00b3\/yr, whereas the\u00a0deeper source (7\u201312 km depth) inflated at a rate of 2 x 10^6\u00a0m\u00b3\/yr.\u00a0InSAR observations also reveal subsidence of the 1986 pyroclastic flows on the north flank of Augustine.\u00a0Finite element models of this subsidence indicate\u00a0an initial excess temperature for the pyroclastic flow deposit of 640 \u00b0C and an average thickness of 9.3 m.\n<\/div>\n
\nInSAR observations covering the 2005 – 2006 eruption reveal horizontal displacements of up to 20 mm, which is in agreement with continuous GPS measurements. Post-eruption InSAR observations show post-eruption contraction of 2006 and 1986 eruptive products, but no volcano-wide deformation pattern.\n<\/div>\n<\/div>\n","latitude":"59.363","longitude":"-153.43","images":[{"path":"\/nas\/content\/live\/cometnerc\/wp-content\/uploads\/figures_sentinel\/augustine\/augustine_131D_03002_121313.jpg","url":"https:\/\/comet.nerc.ac.uk\/wp-content\/uploads\/figures_sentinel\/augustine\/augustine_131D_03002_121313.jpg","width":501,"height":669,"mime":"image\/jpeg","size":77193,"filename":"augustine_131D_03002_121313.jpg"},{"path":"\/nas\/content\/live\/cometnerc\/wp-content\/uploads\/figures_sentinel\/augustine\/augustine_036A_03033_131312.jpg","url":"https:\/\/comet.nerc.ac.uk\/wp-content\/uploads\/figures_sentinel\/augustine\/augustine_036A_03033_131312.jpg","width":501,"height":669,"mime":"image\/jpeg","size":76493,"filename":"augustine_036A_03033_131312.jpg"}],"uri":"https:\/\/comet.nerc.ac.uk\/volcanoes\/augustine\/","api_endpoint":"https:\/\/comet.nerc.ac.uk\/wp-json\/volcanodb\/v1\/volcano\/726","measurement_methods":"InSAR, GPS - continuous, GPS - campaign, EDM","inferred_causes":"Magmatic, Surface deposits","references":["Pauk, B. A., Jackson, M., Feaux, K., Mencin, D., & Bohnenstiehl, K. (2010). The Plate Boundary Observatory permanent Global Posi- tioning System network on Augustine Volcano before and after the 2006 eruption. In J. A. Power, M. L. Coombs, & J. T. Freymueller (Eds.), The 2006 eruption of Augustine Volcano, Alaska (pp. 467\u2013477). U.S. Geological Survey Professional Paper 1769.","Cervelli, P., Fournier, T., Freymueller, J., & Power, J. A. (2006). Ground deformation associated with the precursory unrest and early phases of the January 2006 eruption of Augustine Volcano, Alaska. Geophysical Research Letters,33, L18304. doi:10.1029\/ 2006GL027219.","Lee, C.-W., Lu, Z., Jung, H.-S., Won, J.-S., & Dzurisin, D. (2010a). Surface deformation of Augustine Volcano, 1992\u20132005, from multiple-interferogram processing using a refined small baseline subset (SBAS) interferometric synthetic aperture radar (InSAR) approach, chapter 18. In J. Power, M. L. Coombs, & J. T. Freymueller (Eds.) The 2006 Eruption of Augustine Volcano, Alaska (pp. 453\u2013465). U.S. Geological Survey Professional Paper 1769. Retrieved from http:\/\/pubs.usgs.gov\/pp\/1769\/chapters\/ p1769_chapter18.pdf","Lu, Z., and Dzurisin, D., 2014, InSAR imaging of Aleutian volcanoes: Chichester, UK, Springer-Praxis, 390 p.","U.S. Geological Survey Alaska Volcano Observatory (AVO) website
\nhttp:\/\/www.avo.alaska.edu\/volcanoes\/volcinfo.php?volcname=Augustine"],"date_added":"2015-03-17 14:39:34","last_modified":"2015-03-17 14:39:34"}