I had the privilege of attending an Ohio Seismic Workshop and wanted to share some discoveries.
First: TWO quakes are recorded in each image below. They were so close together in distance and time, the results overlap and blend.
1st Quake = M7.2 near New Caledonia (East of Australia) on 8/12/2016 at 1:26:35 UTC (21:26:35 EDT)
2nd Quake = M6.1 South of Fiji Islands at 3:29:27 UTC (23:29:27 EDT), just two hours later!
Distance between the two? ~840Miles (1,352 km)
Surface Distance to LCHO? ~8,166 miles (13,142km) (Remember shock waves go deep and take short cuts.)
Below is BGSO (at BGSU), closest neighbor to LCHO. Notice you see “calm” before and after the waves caused by the quakes. BGSO is an older station and it not as sensitive. Can’t see the two quakes? Either can I! Image throwing two rocks in a quiet pond and watching the resulting waves reach the shore. The waves will blend and continue for a long time (Well over 2 HOURS! A huge ringing bell!) (Click on Image to Enlarge)
Notice the first ripples of a quake start around 21:46 UTC or 20 minutes later ! The shock waves travel 8,166 SURFACE miles, (less distance moving BELOW the surface) in only 20 MINUTES!
Below is new “sister” station KLSO in Champaigne County, Ohio (West of Columbus)
You notice far sharper tracings and little disturbances of unknown origin. This indicates the new sister station is far more sensitive than the earlier models.
AND FINALLY…below is the new, but VERY NOISY “brother” station LCHO.
You see the blended quakes but also notice all the TRAFFIC NOISE?
It’s the traffic noise that distorts the recordings. This creates a problem for seismologists that use the fine details of the waves to determine info about each quake and the nature of the rock formations below. Imagine trying to listen to a concert surrounded by loud barking dogs.
The experts are discussing ways to filter out the noise. My vote is to let it be, so we get the big picture.
Next up, I was told there is a fault line very close to our station…Stay tuned for, “Finding Fault with the Neighbors!”