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Over many weeks, you may have observed that there is a mysterious (and yet, curious) seismogram signature in the 15:00hr UTC (10:00 am CST).  We don’t have a logical interpretation behind this recurring “event”.  Below is this week’s series of screenshots from the seismograph.  Here is what we DO know:

  1. It occurs consistently in the early part of the 15:00hr UTC
  2. Our personal sprinkler system does NOT run during that hour
  3. The neighborhood’s sprinkler system does NOT run during that hour
  4. The pool’s pumps do NOT run during that hour.
  5. Neighborhood construction begins before 13:00hrs UTC (08:00 am CST) and continues throughout the day on multiple lots – the “event” is only observed during the 15:00hrs UTC
  6. We live about 200 yrds from a large reservoir which has no circulation system

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Any hypotheses are welcomed!

2 Powerful Earthquakes in 24 Hours: Iraq and Jaco, Costa Rica

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Over the last 24 hours, two very strong earthquakes have rocked the globe.  On November 12, 2017 18:18hrs UTC a magnitude M7.3 and focal depth of 23kms earthquake occurred near the Iraq-Iran border, and 18hrs later on November 13, 2017 02:28hrs UTC and focal depth 20kms, a magnitude M6.5 earthquake shook Costa Rica.  Both powerful events were recorded very clearly at Station E1TX.  In the sesimograph screenshot below, the red arrow indicates the Costa Rica event and the Iraqi event is the earlier event. Each image in the slideshow has been captioned.

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Powerful M7.3 Earthquake Shakes Iraq

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A very large earthquake hit Iraq-Iran border around 18:18 hrs UTC on November 12, 2017. The quake had powerful magnitude of M7.3 (Mww) and was approximately 23kms deep. Several seismic wave phases are easily see on this seismogram, including the large Surface Waves:

TEACHABLE MOMENT: Data you do not have is valuable

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TODAY’S TEACHABLE MOMENT from Station E1TX brings up an excellent question from students:  I do not see (observe) any change or reaction, so why do I need to record this event in my journal?  In science, the lack of an observation or “missing” data is valuable.  The question posed leads to inquiry and further investigation of hypotheses.  Example: if we did not observe a “P” wave on a seismogram recorded at Station E1TX, then we may infer the epicenter was approximately deg away from our location.  What other information can “missing” pieces confirm or rule out ?  Below is (1) the screenshot from E1TX’s seismograph, and (2) the extracted seismogram from the recorded data – can you find the M6.5 earthquake in Papua New Guinea?  07112017_2126_scrnsht_PNG07112017_2126_extract_PNG

Insights about the Earth: Tonga to Texas

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A very large magnitude 6.8 (Mww) earthquake occurred today, November 4, 2017 at 09:00hrs UTC (04:00 am CST).  Last month, a similarly large magnitude 6.0 (Mww) occurred near the same epicentral location – both offshore of Tonga.  Both earthquakes had focal depths of 10kms.  We interpreted both seismograms and compared the seismic wave phases – for purpose of scaling issues, we only show the first arrivals (P waves) of each event.  For ease of visual comparison, note that the M6.0 event has a more compressed time scale compared to the 11-04-2017 M 6.8 event.  We can begin to infer broad-scale geology, from Tonga to Texas, when we observe consistent patterns of seismic wave phases  (again, shown here are the P waves’s arrivals).


Shaking the North Pole – Thrice!

Within the past 3 hours there have been 3 earthquakes at Earth’s North Pole.  The moderate sized (mb ~ 5.7) events have been occurring at focal depths estimated at 10kms.  The first two quakes can be interpreted as fore shocks of the third quake – interestingly, the first two quakes occurred within 3 minutes of each other.  The events occurred at 16:13, 16:16 and 19:11hrs UTC.  All three events were detected by Station E1TX and the last event at 19:11hrs UTC is the easiest to see on the seismogram (red arrow).


The last earthquake in a series of 3 at the North Pole


Three earthquakes within 3 hours at the North Pole