Hi.

Some months back i recorded a Ml1.8 event (epicenter at 22km), the P wave
is perfectly noticed, but the S wave is somewhat lost.

This is a picture of the earthquake (no filter applied)..i can get the sac
file if anyone is interested. A IDA station located more near from the
epicenter also have this "issue" in this earthquake, clear P wave, S wave
bit lost.
http://imageshack.us/a/img252/2303/12102012.png

I=B4ve this video from another event (Ml2.9) near that area, also doesnt ha=
ve
a clear S wave.
https://www.youtube.com/watch?v=3Dj0P2y2ahDNg

In the Ml1.8 event the lack of a clear S Wave is more evident, what
happened to the S wave? This events occured near a volcanic region, but
i=B4ve recorded earthquakes from other volcanic regions, and i have always =
a
clear P, S wave.

I apreciate any thought on this.

Regards,
Tiago.
Hi.

Some months back i recorded a Ml1.8 event (epicenter at 22km), t=
he P wave is perfectly noticed, but the S wave is somewhat lost. 

Th=
is is a picture of the earthquake (no filter applied)..i can get the sac fi=
le if anyone is interested. A IDA station located more near from the epicen=
ter also have this "issue" in this earthquake, clear P wave, S wa=
ve bit lost.

http://imagesha=
ck.us/a/img252/2303/12102012.png

I=B4ve this video from another =
event (Ml2.9) near that area, also doesnt have a clear S wave.
https://www.youtube.com/=
watch?v=3Dj0P2y2ahDNg


In the Ml1.8 event the lack of a clear S Wave is more evident, what hap=
pened to the S wave? This events occured near a volcanic region, but i=B4ve=
 recorded earthquakes from other volcanic regions, and i have always a clea=
r P, S wave.


I apreciate any thought on this.

Regards,
Tiago.