Tiago- I call it a seismometer Burp (hiccup is good too)- happens with the
1 Hz phones, although I think all seismometers do it, but not as much.  I
use 1 Hz phones in the desert for field work & in the summer they did this
a lot, until I painted them with a white epoxy paint.
You need another sensor recording nearby to see if the ground actually
moved............    Jim


On Wed, Oct 9, 2013 at 4:33 PM, Tiago A.  wrote:

> Hi.
>
> 20 minutes ago i was checking AmaSeis and i saw "live" some strong motion=
s
> at 2.5Hz, i=B4ve been using a L4 1Hz geophone for almost two years and on=
ly
> saw 3 times this type of recording, but all are similar in duration and
> frequency (amplitude cant say from last year, but the previous recording
> from today has the same electronic settings, ie gain, filtering).
>
> Todays recording are bit noisy, some bad weather around here, but pretty
> sure this isnit the cause of the recording. The last recording happened
> 23pm, so everything is quite outside.
>
> Anyone have any idea what can be the cause of these recordings? Maybe the
> geophone had a "hiccup"?
>
> Best Regads,
> Tiago.
>
Tiago- I call it a seismometer Burp (hiccup is good too)- =
happens with the 1 Hz phones, although I think all seismometers do it, but =
not as much. =A0I use 1 Hz phones in the desert for field work & in the=
 summer they did this a lot, until I painted them with a white epoxy paint.=


You need another sensor recording nearby to see if the ground actually move=
d............ =A0 =A0Jim


On Wed, Oct 9, 2013 at 4:33 PM, Tiago A. <tiagoagre@gma=
il.com> wrote:

Hi.
=

20 minutes ago i was checking AmaSeis and i saw "live" =
some strong motions at 2.5Hz, i=B4ve been using a L4 1Hz geophone for almos=
t two years and only saw 3 times this type of recording, but all are simila=
r in duration and frequency (amplitude cant say from last year, but the pre=
vious recording from today has the same electronic settings, ie gain, filte=
ring).=A0=A0 



Todays recording are bit noisy, some bad weather around here, but=
 pretty sure this isnit the cause of the recording. The last recording happ=
ened 23pm, so everything is quite outside.

Anyone have any idea what=
 can be the cause of these recordings? Maybe the geophone had a "hiccup"?



Best Regads,
Tiago.