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In reply to the discussion: Magnitude 7.4 quake hits Philippines, no tsunami threat [View all]bananas
(27,509 posts)62. 33 km is a default depth (so are 5 and 10 km)
Whenever you see 5, 10, or 33 km, assume they don't have enough data yet for a good estimate.
http://earthquake.usgs.gov/earthquakes/glossary.php
Glossary of Terms on EQ Maps
<snip>
Depth
The depth where the earthquake begins to rupture. This depth may be relative to mean sea-level or the average elevation of the seismic stations which provided arrival-time data for the earthquake location. The choice of reference depth is dependent on the method used to locate the earthquake. Sometimes when depth is poorly constrained by available seismic data, the location program will set the depth at a fixed value. For example, 33 km is often used as a default depth for earthquakes determined to be shallow, but whose depth is not satisfactorily determined by the data, whereas default depths of 5 or 10 km are often used in mid-continental areas and on mid-ocean ridges since earthquakes in these areas are usually shallower than 33 km.
<snip>
Glossary of Terms on EQ Maps
<snip>
Depth
The depth where the earthquake begins to rupture. This depth may be relative to mean sea-level or the average elevation of the seismic stations which provided arrival-time data for the earthquake location. The choice of reference depth is dependent on the method used to locate the earthquake. Sometimes when depth is poorly constrained by available seismic data, the location program will set the depth at a fixed value. For example, 33 km is often used as a default depth for earthquakes determined to be shallow, but whose depth is not satisfactorily determined by the data, whereas default depths of 5 or 10 km are often used in mid-continental areas and on mid-ocean ridges since earthquakes in these areas are usually shallower than 33 km.
<snip>
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Thank you. I keep seeing the doorway thing and that is outdated. Table or desk is best.
uppityperson
Oct 2013
#28
Best thing to do, recommended thing, is to get under a table or desk. Poor people.
uppityperson
Oct 2013
#24
22 miles deep. wouldn't that depth mitigate some of the destructive potential?
Adsos Letter
Oct 2013
#31
Yes, I hope so too except the OP heard what sounded like damage and then the line cutoff.
DCBob
Oct 2013
#33
Never mind, looks like 1 quake. In which case, here is link to a gd thread.
uppityperson
Oct 2013
#32
I have a relative in Mindanao and she just posted on Facebook it was really strong.
DCBob
Oct 2013
#45
Depth recalculated to 57 km vs initially at 33, good news, fewer expected fatalities.
uppityperson
Oct 2013
#52
Thank you, I didn't know that. I have learned several things on DU recently. Thanks
uppityperson
Oct 2013
#63
Now saying 20 dead confirmed. Glad it was morning there, people were outside their homes
uppityperson
Oct 2013
#58