Thank-You Stephen as that IS VERY USEFUL INFORMATION......   Jim


Jim O'Donnell- Geophysical Consultant/Contractor
Geotechnical/Geothermal/Oil & Gas/Mining Applications
Seismic Surveys- Surface Waves, Refraction, & Reflection
Ground Penetrating Radar, Resistivity, Magnetic, & VLF-EM Surveys
Geophysics@..........  702.293.5664  702.281.9081 cell   =

Boulder City, NV


---------- Original Message ----------
From: Stephen & Kathy 
To: psn-l@..............
Subject: Re: Instrument quality - microseisms
Date: Wed, 21 Oct 2009 20:53:13 -0700

Hi Barry, I'm a little south of you...   I also have increased noise.  W=
henever I see this kind of noise, I check with Berkeley at:
http://quake.geo.berkeley.edu/bdsn/make_seismogram.html

If you just create plot without setting time, it will create todays seis=
mogram for CMB... I use 4 for compression to get an hour per line;  and =
pixels at 25 to get a little separation.  Sorry if I am sharing old info=
....   if so, maybe it will help others? =


If you check the following ocean weather link you will see why...  there=
 are 20 to 25 foot waves off the NW USA coast.   Earlier, they were show=
ing up to 30 foot waves. You can click on any box to see the conditions =
in the box...  I click on the box that shows Alaska to below Baja...   a=
nd yes, the energy is apparently coming from 200 to 400 miles away:
http://www.oceanweather.com/data/

At one time I had my gain so high that noise like this would set off my =
alarm, (I have a separate alarm, which I built before I had a computer a=
nd recording capability).
  Stephen
  PSN Station #55
  38.828N  120.979W
  near Pilot Hill Calif   =


Barry Lotz wrote: =

To all
Related to instrument quality- maybe. I have noticed a lot more microsei=
smic activity the last few days. The background noise on my vertical is =
around +/- 300 counts @  8.7 sec  and 6.6 sec  (two narrow peaks). I don=
't remember this magnitude in years past. I'm sure it is weather related=
.. I live about 200 miles east of the west coast of northern California. =
Anyone else noticed an increase in background lately? Every time I look =
at the output I think I'm looking at surface waves after an event.
Barry

Thank-You Stephen as that IS VERY USEFUL INFORMATION......&nb=
sp;  Jim


Jim O'Donnell- Geophysical Consultant/Cont=
ractor
Geotechnical/Geothermal/Oil & Gas/Mining Applications
S=
eismic Surveys- Surface Waves, Refraction, & Reflection
Ground Pe=
netrating Radar, Resistivity, Magnetic, & VLF-EM Surveys
Geophysi=
cs@..........  702.293.5664  702.281.9081 cell   Boulder City, NV


---------- Original Message ----------
F=
rom: Stephen & Kathy <skmort@............>
To: psn-l@webtro=
nics.com
Subject: Re: Instrument quality - microseisms
Date: Wed, =
21 Oct 2009 20:53:13 -0700

Hi Barry, I'm a li=
ttle south of you...   I also have increased noise.  When=
ever I see this kind of noise, I check with Berkeley at:
http://quake.geo.berkeley.edu/bdsn/make_seismogram.html

If you just create plot without setting time, it will create to=
days seismogram for CMB... I use 4 for compression to get an hour per li=
ne;  and pixels at 25 to get a little separation.  Sorry if I =
am sharing old info...   if so, maybe it will help others? 
If you check the following ocean weather link you will see why...&n=
bsp; there are 20 to 25 foot waves off the NW USA coast.   Ear=
lier, they were showing up to 30 foot waves. You can click on any box to=
 see the conditions in the box...  I click on the box that shows Al=
aska to below Baja...   and yes, the energy is apparently comi=
ng from 200 to 400 miles away:
http://www.oceanweather.com/data/

At one time I had my gain so high that noise like this would se=
t off my alarm, (I have a separate alarm, which I built before I had a c=
omputer and recording capability).
  Stephen
  PSN Stati=
on #55
  38.828N  120.979W
  near Pilot Hill Calif =
  

Barry Lotz wrote: =


<=
/TR>




To all
Related to instrument quality- m=
aybe. I have noticed a lot more microseismic activity the last few days.=
 The background noise on my vertical is around +/- 300 counts @  8.=
7 sec  and 6.6 sec  (two narrow peaks). I don't remember this =
magnitude in years past. I'm sure it is weather related. I live about 20=
0 miles east of the west coast of northern California. Anyone else notic=
ed an increase in background lately? Every time I look at the output I t=
hink I'm looking at surface waves after an event.
Barry