PSN-L Email List Message

Subject: Re: Locating earthqukes with winquake
From: ChrisAtUpw@.......
Date: Tue, 3 Oct 2006 18:53:16 EDT

```In a message dated 2006/10/03, jonfr500@......... writes:

> Is it possible for me to locate earthquakes with Winquake ? Because I am
> going to setup a remote station soon, probably after 2 - 3 months (depending on
> few things). The remote station won't be internet connected, but I will
> collect data from it once a month.
>
> Sometimes next week I will also get one sensor reading regarding an
> earthquake that I did detect this summer, I am going to attempt to locate that
> earthquake to some existent just by using two stations.

Hi Jon,

Before you spend any money....

The P wave may travel at ~8 km /sec. You are going to need fairly
widely separated stations to get a reasonably accurate angle estimate, depending
on the distance. You can determine the approximate distance from the P-S
interval. Can you get on-line signals from one of the Icelandic seismic stations as
your second source? At least to try out?

If you are going to use this method, you will need precision timing at
all times, about 0.1 sec or better. You are lucky if the software clock on a
computer is accurate to 30 sec / day! They are hopeless for seismic work. This
is likely to need a GPS receiver at both stations.

Could you use an internet link?

What sort of sensors were you planning to use? Regional and
teleseismic quakes need a response down to 0.5 Hz.

Regards,

Chris Chapman
In a me=
ssage dated 2006/10/03, jonfr500@......... writes:

Is it possible for me to locate=
earthquakes with Winquake ? Because I am going to setup a remote station so=
on, probably after 2 - 3 months (depending on few things). The remote statio=
n won't be internet connected, but I will collect data from it once a month.=

Sometimes next week I will also get one sensor reading regarding an earthqua=
ke that I did detect this summer, I am going to attempt to locate that earth=
quake to some existent just by using two stations.

Hi Jon,

Before you spend any money....

The P wave may travel at ~8 km /sec. Yo=
u are going to need fairly widely separated stations to get a reasonably acc=
urate angle estimate, depending on the distance. You can determine the appro=
ximate distance from the P-S interval. Can you get on-line signals from one=20=
of the Icelandic seismic stations as your second source? At least to try out=
?

If you are going to use this method, yo=
u will need precision timing at all times, about 0.1 sec or better. You are=20=
lucky if the software clock on a computer is accurate to 30 sec / day! They=20=
are hopeless for seismic work. This is likely to need a GPS receiver at both=
stations.

Could you use an internet link?

What sort of sensors were you planning=20=
to use? Regional and teleseismic quakes need a response down to 0.5 Hz.

Regards,

Chris Chapman
```