1. Outline Brief overview of tectonic setting
Arrival extraction and association
Relocation using 1D and 3D velocities
Rejection of poor data
1 D velocity inversion
Tomography model design
3D velocity inversion

2. Data Extraction Data Sources: Extraction Parameters
Cornell picks in Morocco and Spain
Morocco Catalog ( )
USGS NEIC Bulletin ( )
ISC Bulletin ( )
Extraction Parameters
Station list
Regional: (P & S) Event within region of interest
Teleseismic: (iP) Event-Station distance (30°-90°)*

3. Data Merging Event association by location and time
Regional: 6,300 EQs & 53,000 phases
Tele: 14,400 EQs !
Estimation of pick errors
Comparison of independant picks
Choose preferred order of picks
Extract best location and picks > 6 Stations
Regional: EQs and 46,000 Phases
Tele: EQs

4. Relocation Sphrel3d90 (written by Steve Roecker) 1D or 3D model
Rays traced through average 1D model between event and station
Travel time accumulated along ray using 3D model velocities
Multiple starting depths
Progressive reduction of residual cutoffs from 100 secs to 4 secs
Choose location with lowest RMS residual

5. Data weeding Criteria Leaves ~1000 EQs and 15,000 Phases
RMS Residual < 2.0 s
Closest Station Distance < 100 km
Azimuth Gap < 200°
Average Residual < 1.0 s
Theoretical Location Error < 10 km
Last iteration step < 3 km
Minimum Depth < km
Condition Number < 100*
Leaves ~1000 EQs and 15,000 Phases

6. 1D inversion Sphypit90 (written by Steve Roecker)
Rays traced through average 1D model between event and station (IMPORTANT)
Travel time accumulated along ray using model velocities
Event mislocation effect removed
Least Squares Singular Value Decomposition of residuals for P & S velocity
1D or 3D model
Iteration of slowness inversion and relocation
Removal of event that fails criteria or moves by > 10 km.