(09-13-2024, 05:17 PM)Maxmars Wrote: This was offered as an explanation of negative depths in seismic reports in the Hawaii area... perhaps it's something similar reporting effect(?)
Astute visitors to the USGS Hawaiian Volcano Observatory (HVO) website may have noticed that some recent earthquakes have negative depths. This does not indicate a change in seismicity but, rather, an upgrade in HVO's seismic data processing system.
[Image: https://d9-wret.s3.us-west-2.amazonaws.c...k=QBVqZkoB]
The new system reports earthquake depths with respect to the common reference elevation, or datum, of sea level. When set to display earthquakes by depth, the HVO website map now includes a dark red color to indicate earthquakes that occur above sea level but below the ground surface. In the earthquake list to the right of the map, some events are now reported with negative depths.
Not saying this is your answer, but it's worth mentioning.
Good thought, I wonder if all those different regions would have the same issues though. California and Neveda but not Arizona. Montana is a real out layer given the Idaho wasn't affected.
a new one:
at 15:26 PDT over Blodgett Oregon depth -0.3 Mi
Hawaii doesn't seem to be having this negative epicenter issue, nor is anywhere else in the world. Quite odd.
Still your idea is currently as good as any at this point.
