Hi all,

  I live on Long Island, New York. Local events are very rare here, so what I 
detect are mostly teleseisms.  I consider myself pretty competent at the 
recording and signal processing of such events to obtain accurate broadband 
waveform reproduction and timing. My event waveforms correspond well with those of 
nearby LD network station PAL.

  I do not consider myself competent at P and S phase picking, and need 
advice. What is the criterion for judging phase arrival time? Is it the first 
velocity peak, emergent velocity, first displacement peak, emergent displacement, 
or what? Most of the S phases I record have fairly long period, and the P minus 
S time estimate depends greatly on the S phase time pick.

Cheers,

Bob (PSN station rem)
Hi all,



  I live on Long Island, New York. Local events are very rare here, so=20=
what I detect are mostly teleseisms.  I consider myself pretty competen=
t at the recording and signal processing of such events to obtain accurate b=
roadband waveform reproduction and timing. My event waveforms correspond wel=
l with those of nearby LD network station PAL.



  I do not consider myself competent at P and S phase picking, and need=
 advice. What is the criterion for judging phase arrival time? Is it the fir=
st velocity peak, emergent velocity, first displacement peak, emergent displ=
acement, or what? Most of the S phases I record have fairly long period, and=
 the P minus S time estimate depends greatly on the S phase time pick.



Cheers,



Bob (PSN station rem)