Hi all,

One year ago I started recording earthquakes with three 4.5 Hz =

Mark Products geophones. These geophones are only sensitive to =

local earthquake activity. =


The problem is, I am missing the large distant earthquakes.
To be able to detect the larger distant events I will need
a long period seismograph.

I tried to build my own device several times, but without good
results.

My question is, do anyone know of any source where I can buy a good
working seismograph or parts? Perhaps someone who is willing to =

build one for me? =


I am looking forward to hear from you.

Best regards,

Marchal van Lare
-Nieuwvliet, The Netherlands

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