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My new tool helps to visualise fault planes. Example from Eugowra NSW in late 1994. This is about 4 months of activity from the microseismic network we installed, with event depths shifted 4km up. Stoked it looks as clear as it does. It’s inspired me to make my first long thread:
Fun fact #1: the shallowest earthquake was 140m above sea level, about 200m below the surface in those hills. Location errors were as low as 100m.
Fun fact #2: the largest earthquake in the sequence was magnitude 4.1 and registered almost 1g (at high frequency), recorded on the upper floor of the pub/hotel that we stayed at in town
Fun fact #3: Following reports from locals of frequent small earthquakes, I drove up to install the first seismograph in Eugowra. After driving all day, almost there, I get a call to say a magnitude 5 earthquake just happened at Ellalong, so the gear should be diverted there...
I needed to get a few hours sleep before this next 6 hour drive, so I decide to stop in Cowra. Little did I know it was the 50th anniversary of the Cowra Breakout, so there wasn’t a single hotel room for miles around! I had to drive another 40km to find a room in Canowindra.
Fun fact #4: Stations were installed by others @AusQuake soon after, but I finally got to Eugowra in early 1995. This time I had a companion on my field trip: my girlfriend of 2 months. We city slickers were invited to the annual country ball that happened to be on that night...
My beard was born that day. Prepping for the ball, my girlfriend used her eyeliner to outline a goatee into my stubble, saying I would look better with facial hair. We’ve been married for 23 years. I’ve kept a furry face ever since - just in case!
Fun fact #5: @RadioNational interviewed my colleague @PeckyQuake in Eugowra. While sitting on a granite outcrop and recording audio, they felt an earthquake. You hear a crow getting spooked and cawing as it flies off, while they say “did you feel that”?
Fun fact #6: These earthquakes were in the shallow outcropping granite the area is known for. Over 2000 slabs of granite from Eugowra were used in the construction of the new @ausgov Parliament House in Canberra, which had opened a few years earlier in 1988.
Want to know more about these Eugowra earthquakes? I’m the anonymous “SRC seismologist” in the first paper in this document: https://aees.org.au/wp-content/uploads/2013/11/Pages-71-to-96.pdf
