basic facts (location from NEIC)
00/06/04 16:28:25   4.73S 102.05E  33.0 7.9Ms B  SOUTHERN SUMATERA, INDONESIA

also in the trace, with an 11 minutes lag,  is energy from an aftershok that is 10 times smaller.

00/06/04 16:39:45   4.61S 102.07E  33.0 6.7Mb B  SOUTHERN SUMATERA, INDONESIA

If you want to know all the details about this event- go here

Waveforms from our own basement, from the broad-band seismic sensor operated there by Weston Observatory. Traces start at the origin time, with time marked in seconds, and are arranged in the following order: E-W, N-S, V.
Window scaling. [Yes, there is something wrong with N-S component]
P wave arrives about 200 sec into the record, on the Z component.
Note that energy from the earthquake continues to come for 2 hours !!

here is an unfiltered record, window-scaled:

If the quake is large, you will see it....
Here is data filtered above 1000 seconds, below 100 seconds: