PSN-L Email List Message

Subject: Re: Figi event
From: Mark Robinson mark.robinson@...............
Date: Tue, 11 Dec 2007 09:40:12 +1300


Thomas Dick wrote:
> Thanks John and Bob. I have started from the beginning at least five 
> times and save within WinQuake dozens of times now. I have made mistakes 
> before so I didn't admit this problem quickly.I got good results on this 
> quake. I have put the numbers in maybe fifty times. It doesn't matter. 
> Using the data below and resetting P and S manually within Winquake I 
> can get phases to appear but only if I am very close to actual Pdiff and 
> S arrival times. If I am off even a little (checked using locate) all 
> phases disappear and I can't save.
> 
>     ----- Original Message -----
>     *From:* Bobhelenmcclure@....... 
>     *To:* dickthomas01@............. 
>     *Sent:* Sunday, December 09, 2007 10:25 PM
>     *Subject:* Travel Times for Figi event
> 
>     Here is what my travel time program gave for your location.
> 
>     Station: 38.001 -87.5146
>       Event:-25.872 -177.517
>     Depth 149.2 km
>     EventTime 07:28:21
>     11716.81 Km
>     Delta  105.43 (deg)
>     Azimuth  249.1673 (deg, station to event)
>     Azimuth  55.0416 (deg, event to station)
> 
>                 travel   arrival      ground
>                 time     time         velocity
>     Pdif         833.6   07:42:14.6   24.701
>     PP          1099.5   07:46:40.5   15.089
>     PPP         1228.1   07:48:49.1   12.939
>     SKP(df)     1284.6   07:49:45.6   56.918
>     PKS(df)     1299.9   07:50:00.9   56.821
>     pPKS(df)    1359.6   07:51:00.6   56.82
>     sPKS(df)    1390.2   07:51:31.2   56.624
>     SKS(ac)     1457.7   07:52:38.7   24.977
>     SKS(df)     1500.7   07:53:21.7   57.314
>     sSKS(ac)    1562.0   07:54:23.0   24.749
>     sSKS(df)    1605.8   07:55:06.8   56.827
>     SP          1633.1   07:55:34.1   11.155
>     PS          1650.8   07:55:51.8   11.283
>     SPP         1687.1   07:56:28.1   9.286
>     PPS         1707.5   07:56:48.5   9.41
>     PKKP(bc)    1769.2   07:57:50.2  -39.471
>     PKKP(df)    1778.3   07:57:59.3  -61.811
>     PKKP(ab)    1789.6   07:58:10.6  -25.079
>     pPKKP(bc)   1828.3   07:58:49.3  -38.804
>     pPKKP(df)   1838.0   07:58:59.0  -61.811
>     pPKKP(ab)   1847.0   07:59:08.0  -25.05
>     sPKKP(bc)   1859.2   07:59:20.2  -39.024
>     sPKKP(df)   1868.6   07:59:29.6  -61.811
>     sPKKP(ab)   1878.3   07:59:39.3  -25.065
>     SS          1981.8   08:01:22.8   8.165
>     SSS         2222.8   08:05:23.8   7.214
>     PKPPKP(df)  2273.3   08:06:14.3  -59.221

There's another page on the USGS site which shows the shadow effect in 
operation for this quake for stations in the USA by plotting traces by distance 
in degrees:

     http://neic.usgs.gov/neis/eq_depot/2007/eq_071209_ksak/neic_ksak_r.html

I suspect that the considerable attenuation is causing WinQuake's phase picking 
some grief.
-- 
Mark Robinson
-------------
11 Dec 1951 Yankee slugger Joe DiMaggio announces his retirement from baseball.
11 Dec 1991 EEC aggrees to political federation and common currency by 1999.
__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


[ Top ] [ Back ] [ Home Page ]