NMSZ Background Information
USGS Seismic Hazard Map for the NMSZ
Final Technical Report of Risk Engineering, Inc. on Central US Seismic Hazard
Seth Stein’s 1999 Discussion of New Madrid Seismic Hazard and GPS results
Map of North American seismicity, cGPS sites, and location of NMSZ
NMSZ Continuous GPS Site Locations, Seismicity, and Topography
Project Summary from Univeristy of Arkansas USGS NEHRP award 02HQGR0107
2002 Progress Report USGS NEHRP award 02HQGR0107
Photo of HCEX-HCES Co-located cGPS monuments
Current Seismicity from CERI
Recent Earthquakes in the NMSZ
Recent Events and Publications
Smalley et al., 2005 Nature article
Brief Communication Arising on Smalley et al., 2005 by Calais, Mattioli et al. 2005
UARK Press Release of January 24, 2006 on NMSZ research
Eric Calais’ NMSZ analysis site at Purdue University
2007 Final Report USGS NEHRP award 02HQGR0107
UARK GIPSY-OASIS-II Time Series
All the time series shown below are based on the publically available data from the GAMA network of CERI. The data were obtained from SOPAC and UNAVCO archives, converted to RINEX using TEQC and processed using JPL’s GIPSY-OASIS-II software (v. 4 for Linux), final precise orbits, clocks, and earth orientation parameters with a free-network, absolute point-positioning strategy. Ocean-loading coefficients for each site were obtained using the Scherneck model of the Onsala Space Observatory. Initial free-network solutions were transformed into ITRF2000 using JPL’s xfiles and the secular motion of the North American plate was removed based on current realization of the DeMets et al. (2000) NAM-ITRF00 euler pole. Common mode errors at each site were removed (up to Sep. 2004) using the NLIB cGPS site as a regional reference with a method modified after Wdowinski et al., 1997. The resulting residual position time series are then fit after outliers are removed using a linear least-squares inversion with formal estimates of white and flicker noise and an assumed random walk monument noise of 1 mm/sqrt(yr) as discussed by Mao et al. (1997). No offsets (e.g. for equipment changes) of any kind were included in the analysis. Final results are graphed and displayed using GMT. Each red dot represents a 24-hour point position estimate. Formal errors for each position are not shown for clarity. All gaps in the time series are the result of data loss because of equipment and communication breakdowns in the GAMA network (Smalley, pers. comm.).
GAMA sites
NAM reference sites
UARK summary results
UARK Table of Results, UARK Table of Results – 2
RLAP-NWCC Baseline Evolution Plot
UARK NMSZ Photo Archive
All photos in this archive were shot by G. Mattioli using a Nikon D100 digital camera (fine setting 3000 x 2008 pixels) with Nikkor AF-S 24-85 mm lens.
All images are copyrighted (2003, 2004) by Glen S. Mattioli.
Images may be freely used for non-commercial purposes with appropriate source attribution.