M6.6 Earthquake Near Tanaga Volcano, Alaska

On 15 August 2018, at 21:56hrs UTC (4:56pm CST) a large magnitude M6.6 earthquake occurred near #TanagaVolcano, #Alaska.  #TXESP continues our research comparing differing #seismictechnologies and their commonalities, inconsistencies and reliability to detect and record #groundmotion, including #teleseismic waves.  The image presents two seismograms from two different instruments – the #EQ1 $educationalseismograph and the less expensive #RaspberryShake. Note the ~2 minute time delay of the first #wave arrival on the EQ1 seismograph.  What may explain this discrepancy?

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