Figure 1. Location of 94 origins with arrivals at both the OBS and land arrays. These are the locations determined using only the OBS arrivals.
Figure 2. The same events in Figure 1 located using both OBS and land array arrivals.
Figure 3. Arrows showing direction of movement of origins as located using only OBS arrivals to locations using both OBS and land array arrivals. Average change in location is 12 km.
Figure 4. Same as Figure 3, but zoomed in on the region of dense epicenters just west of the OBS array.
Figure 5. 90% error ellipses for the origins using only the OBS arrival data.
Figure 6. 90% error ellipses for the origins using only both the OBS and land stations arrivals.
| OBS only | OBS+Land | |
| Ave Ndef | 13 | 23 |
| Ave sdobs | 294 | 552 |
| Ave smajax (km) | 6.6 | 4.0 |
| Ave sminax (km) | 3.6 | 1.8 |
Ndef is the number of phases used to locate an event
sdobs is the standard error (rms traveltime misfit)
smajax is the length in km of the semi-major axis of the error ellipse
sminax is the length in km of the semi-minor axis of the error ellipse
