reply to post by alysha.angel
Hi Alysha,
I know you've had several responses to this already but thought I'd add a little more...
Indonesia is a
such tough area to keep track of. It's so seismically and volcanically active that it's hard to remember all that goes on
there except for the really bad stuff. So I did a search of the NEIC database for quakes of mag 5 or greater within a radius of 80 km (50 miles) of
Toba (whose coordinates are 2°35'10"N 98°50'8"E).
Here are the results:
NEIC: Earthquake Search Results
U. S. G E O L O G I C A L S U R V E Y
E A R T H Q U A K E D A T A B A S E
FILE CREATED: Fri Mar 5 16:26:17 2010
Circle Search Earthquakes= 22
Circle Center Point Latitude: 2.350N Longitude: 98.500E
Radius: 80.000 km
Catalog Used: PDE
Date Range: 1980/01/01 to 2010/03/04
Magnitude Range: 5.0 - 10.0
Data Selection: Historical & Preliminary Data
CAT YEAR MO DA ORIG TIME LAT LONG DEP MAGNITUDE IEM DTSVNWG DIST
NFO km
TF
PDE 1980 07 22 112526.70 2.63 99.13 163 5.0 mbGS ... ....... 76
PDE 1981 01 11 150946 2.06 98.07 69 5.7 mbGS ... ....... 57
PDE 1984 09 13 191655.80 1.94 98.97 150 5.0 mbGS ... ....... 69
PDE 1986 06 14 145103.55 2.04 98.00 66 5.4 mbGS ..M ....... 65
PDE 1987 04 25 192207.20 2.24 98.87 11 6.6 MsGS .CM ......G 42
PDE 1987 04 28 153230.56 2.05 99.09 19 5.6 mbGS ..M ....... 72
PDE 1993 11 01 000119.65 2.04 98.12 83 5.3 MwHRV ..M ....... 54
PDE 1995 07 15 024256.83 2.67 99.07 165 5.4 MwHRV ..M ....... 72
PDE 1999 04 22 065040.23 1.93 98.04 63 5.0 mbGS ... ....... 69
PDE 2000 01 06 005617.59 2.01 98.04 33 5.1 MwHRV ..M ....... 63
PDE 2002 01 04 150958.92 1.95 97.92 42 5.2 MwHRV ..M ....... 78
PDE 2004 11 27 224235.32 1.98 97.93 41 5.4 MwHRV ..M ....... 75
PDE 2005 03 28 172332.83 2.84 98.76 30 5.2 mbGS ... ....... 60
PDE 2005 04 03 031056.47 2.02 97.94 36 6.3 MwGS 4FM ....... 71
PDE 2005 09 02 080404.98 2.45 98.92 147 5.5 MwHRV 3FM ....... 48
PDE 2005 10 16 190324.42 2.03 97.94 38 5.7 MwGS 4FM ....... 71
PDE 2006 12 19 124816.60 2.46 98.00 66 5.0 MwGCMT 3FM ....... 56
PDE 2007 03 07 105337.59 1.96 97.91 35 5.9 MwGS 4FM ....... 78
PDE 2007 07 24 145131.68 2.27 98.00 62 5.3 MwGCMT 5FM ....... 56
PDE 2007 12 01 014431.95 1.98 97.88 44 5.9 MwGS 5FM ....... 79
PDE 2008 10 15 080201.41 1.96 97.97 61 5.0 mbGS ... ....... 73
PDE-Q 2010 02 28 121325.40 2.03 98.85 38 5.1 mbGS 3F. ....... 52
If the above table comes up a bit garbled I'll just summarize. Dates on left, then coordinates, then depth in km, then magnitudes; the numbers on the
far right are the distances of the quakes from Toba.
According to the NEIC, there have been 22 quakes of mag 5 or greater within 80 km of Toba, but none of those have been closer to it than 42 km, and
most have been around 60 to 70 km away. (ie around 40 to 45 miles or so.)
This is good news.
On the other hand, of those 22 quakes in the past 30 years, 13 have been in the past 10 years. But even so, there have been only two since the end of
2007: one in '08 and the one on Feb 28, '10.
If there was anything major going on with Toba we would expect to see a fair amount of rumbling close to it, but overall I'd say it's not a big
worry.By all reports it's pretty quiescent these days (but by no means extinct).
Note to Puterman: thank you for your response to my previous query.
Thank you also to other members who are keeping us informed (including the
numerous but avidly-reading lurkers).
Okay, I'll post this and see how the table looks.
Mike
Edit to add a bit more detail.
[edit on 5/3/10 by JustMike]
, there's something getting kinda close to us. 
