6/21/2015 — Deep M6.5 earthquake in the West Pacific — Asthenosphere movement showing yet again

After a period of relative “calm” in the Asthenosphere , which lasted approximately 1 week, over the past few days we have now seen TWO deep earthquakes below Fiji / Tonga in the West Pacific.

asthenosphere june 21 2015a

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The Asthenosphere is an area of semi-melted magma located below the plates / lithosphere / Earth’s crust.

As we have seen in the past, when there is deep movement in the Asthenosphere, the activity is usually followed up by SHALLOW earthquake activity in a nearby adjacent area within a few days of the deep event.

Here is a video explanation of the Asthenosphere movement:

Thus, we need to watch the nearby adjacent areas to these two deep M6.0+ earthquakes for possible shallow larger seismic activity over the next several days.

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Information on the current M6.5 earthquake from the USGS:

Magnitude 6.5 Mb
Location/uncertainty 20.300°S 178.300°W± 0.0 km
Depth/uncertainty 573.0 km± 0.0
Origin Time 2015-06-21 21:28:17.000 UTC
Number of Stations 23
Number of Phases 23
Minimum Distance 493.00 km (4.43°)
Travel Time Residual 1.21 sec
Azimuthal Gap 82.8°
FE Region Fiji region (181)

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Information on the other deep M6.0 event from June 17, 2015:

Magnitude/uncertainty 6.0 mwb± 0.0
Location/uncertainty 20.405°S 178.911°W± 8.5 km
Depth/uncertainty 653.0 km± 4.2
Origin Time 2015-06-16 06:17:00.580 UTC
Number of Stations
Number of Phases 160
Minimum Distance 434.59 km (3.90°)
Travel Time Residual 1.25 sec
Azimuthal Gap 38°
FE Region Fiji region (181)

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