TY - RPRT TI - Global Positioning System constraints on crustal deformation before and during the 21 February 2008 Wells, Nevada M6.0 earthquake AU - William C. Hammond AU - Geoffrey Blewitt AU - Corne Kreemer AU - Jessica R. Murray-Moraleda AU - Jerry L. Svarc PY - 2011 UR - https://pubs.usgs.gov/publication/70041600 ID - 70041600 ER -