The BIG ONE is missing??

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At 18:03hrs UTC, a magnitude M6.5 earthquake shook the Earth near the Bouvet Islands.  The focal depth was ~15kms, about 118 pol deg away, and occurred near a triple junction plate boundary (see map below).  WHY DIDN’T station E1TX record this event (assuming all wave phases)?  Hypothesis: the epicenter (blue dot) was ~118 pol deg was in the P-wave shadow zone – epicentral distances 104 to 140 degrees from the recording station.  If we examine the seismogram closely, it’s possible to interpret a PS wave phase, however no other confident interpretations have been made by the station’s operator.

QUESTION:  Are “missing” wave phases not recorded? did not arrive at location? does it matter?

 

 

Let it Snow, Let it Snow, Let it Snow (and record it, please)

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Once or twice in a calendar year Houston will receive snow – although most non-Houstonians find that statement incredulous.  We have proof! – observations and data measurements are necessary to promising young scientists.  The snow began to fall rapidly in Spring, TX at 9:17 pm CST (03:17hrs UTC).  The red arrow indicates when the first flakes began to fall.  The second image was taken at 07:00 am CST (13:00hrs UTC).

Not so “Still”water, M4.2 earthquake

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Did you feel it?  A small – to –  moderate earthquake M4.2 occurred at bedtime (10:26pm CST) or 04:26hrs UTC.  The focal depth was a very shallow  3.3 kms.  The epicenter is approximately 6.4 polar degrees (or 482 miles) away from Station E1TX. No major damages or injuries have been reported at this time. The map, below, is an interpretation of the intensity experienced by citizens.  The seismogram shows a distinct “P” wave arriving  first followed by the much higher amplitude “S” wave.

To read more about this event, please CLICK HERE.

MYSTERY “SEISMOGRAM”

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CAN YOU HELP US ???

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: