ARLA/CLUSTER: Terramoto na Califórnia afectou a propagação em HF na costa oeste dos EUA

[João Costa > CT1FBF]

California earthquakes disrupted HF propagation on west coast

The ARRL reports earthquakes in California disrupted HF propagation on the
west coast

British Columbia radio amateur *Alex Schwarz, VE7DXW*, said that an
Independence Day magnitude 6.4 earthquake in California’s Mojave Desert and
multiple aftershocks negatively affected HF propagation on the US west
coast.

Schwarz, who maintains the “RF Seismograph� and has drawn a correlation
between earthquake activity and HF band conditions, said the radio
disruption began at around 1600 UTC on July 4, and continued into July 5.
He said that on July 4, the blackout was total except for 20 meters, where
conditions were “severely attenuated,� Schwarz said. The RF Seismograph
also detected the magnitude 7.1 earthquake on July 6 in the same vicinity,
Schwarz reported. The distance between the monitoring station in Vancouver,
British Columbia, and that quake’s epicenter is 1,240 miles.

“Things are back to normal after the strong quake, as far as the ionosphere
is concerned, but the unrest has not stopped yet,� Schwarz told ARRL on
July 8.

Read the full ARRL report at
http://www.arrl.org/news/view/report-california-earthquakes-disrupted-hf-propagation-on-west-coast
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