Position: 19.531°S 69.283°W – Depth: 91.0 km
Heliocoder trace of AM.RC8C73.00.SHZ. The P wave arrival is in the lower right side of the image.
Distance: 59.7 Deg. 6,625 km
Azimuth: 354.4 Deg.
SeisComP3 traces for AM.R8C73.00.SHZ (Exton PA), LD.WUPA.BHZ (West Chester University, West Chester PA), and PE.PSUB.HHZ (Penn State Brandywine Campus, Media PA) showing the P wave arrivals.
Position: 39.054°S 174.977°E – Depth: 227.3 km
SeisComP3 traces for AM.R8C73.00.SHZ (Exton PA), LD.WUPA.BHZ (West Chester University, West Chester PA), and LD.GEDE.SHZ (Greenville DE) showing the initial arrivals which at this distance (127.1 deg) are PKPdf waves (P waves passing through and diffracted by the Earth’s core).
Distance: 127.2 deg. – 14,121 km
Azimuth 65.1 deg
SeisComP3 display showing the focal mechanism for this event.
Position: 57.405°S 66.409°W – Depth 10.0 km
Heliocoder trace of LD.WUPA.SHZ (West Chester PA) showing earthquakes for the previous 24 hours including this event.
SeisComP3 traces for AM.R8C73.00.SHZ (Exton PA), LD.WUPA.BHZ (West Chester University, West Chester PA), and LD.GEDE.SHZ (Greenville DE) showing the P wave arrivals.
Distance: 97.8 deg, 10,853 km
Azimuth: 352.9 deg
SeisComp3 display with fault plane solution for this event.
Position: 12.949°N 90.385°W – Depth: 24.7 km
Seedlink Plotter heliocoder traces of AM.RC8C73.00.SHZ (Exton PA) and LD_WUPA.SHZ (West Chester PA). This event is annotated as “Near Coast of Guatemala, 6.1 Mw”. The body waves are not visible on either trace, but WUPA shows the quake’s surface waves.
Distance: 30.2 Deg. 3,350 km
Azimuth: 22.9 Deg.
SeisComP3 traces for AM.R8C73.00.SHZ (Exton PA), LD.WUPA.BHZ (West Chester University, West Chester PA), and LD.GEDE.BHZ (Greenville DE) showing the P wave arrivals. All three show that the arrival’s are buried in noise. Despite the distance and magnitude, this earthquake barely registered on seismometers in the Philadelphia area.
Position: 37.506°N 20.563°E – Depth: 14 km
From the USGS Information Page:
The October 25th, 2018, M 6.8 earthquake southwest of Lithakia, Greece, occurred as the result of rupture on or near the plate boundary between the Nubia (Africa) and the Eurasia plates. At the location of this earthquake, Nubia converges with Eurasia at a rate of roughly 28 mm/yr, subducting beneath Eurasia. Preliminary focal mechanisms for the earthquake indicate oblique slip on a near-vertical west-northwest striking fault or a moderately dipping north striking fault.
The region surrounding this event is seismically active and earthquakes of this size are not uncommon. Since 1900, 13 other earthquakes M 6.5 and larger have occurred within 200 km of this October 25, 2018, M 6.8 event. The largest was a M 7.3 on October 6, 1947, which occurred 145 km southeast of this event. On June 15th, 1995, a M 6.5 earthquake, 180 km inland to the northeast, resulted in 26 fatalities. On November 17, 2015, a M 6.5 earthquake occurred 130 km to the north, closer to the coast of Greece, resulting in two fatalities.
Jamaseis heliocoder trace (1) and Swarm trace (2) of AM.RC8C73.00.SHZ. The P wave arrival is annotated
Distance: 71.1 Deg. 7,899 km
Azimuth: 306.5 Deg.
Jamaseis trace of LD.WUPA.BHZ (West Chester University, West Chester PA).
SeisComP3 traces for AM.RC8C73.00.SHZ (Exton PA), LD.WUPA.BHZ (West Chester PA), and LD.GEDE.BHZ (Greenville DE).
SeisComp3 screenshot showing the focal mechanism.