M7.6 Earthquake of coast of Mindinao, Philippines

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Discussion Overview

The discussion centers around the recent M 7.6 earthquake off the coast of Mindanao, Philippines, along with its aftershocks and seismic activity in the region. Participants share details about the earthquake's magnitude, depth, and aftershock occurrences, as well as personal observations related to the event.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • Initial reports indicate a M 7.6 earthquake occurred on December 2, 2023, with numerous aftershocks in the Mag 4+ to 5+ range.
  • Participants list several aftershocks, including magnitudes of 5.3, 5.7, and 4.8, with varying depths reported.
  • One participant notes that the earthquake caused significant shaking, waking individuals located 100 km away from the epicenter.
  • A participant describes the earthquake as having a thrust faulting mechanism, indicating the nature of the seismic activity.
  • Another participant highlights the ongoing aftershock activity, mentioning a particularly strong aftershock of M 6.9 and several M6+ events following the main quake.
  • There is mention of historical seismic activity in the area, with references to earthquakes from 1995 and 1999, suggesting a pattern of frequent seismic events.

Areas of Agreement / Disagreement

Participants generally agree on the occurrence of the M 7.6 earthquake and the subsequent aftershocks, but there are varying interpretations regarding the seismic mechanisms and the implications of the aftershock activity. The discussion remains open with no consensus on the broader implications of the seismic events.

Contextual Notes

Details regarding the specific fault lines involved, the geological context of the region, and the potential for future seismic activity are not fully explored, leaving some assumptions and conditions unaddressed.

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M 7.6 - Mindanao, Philippines​

https://earthquake.usgs.gov/earthquakes/eventpage/us7000lff4/executive
  • 2023-12-02 14:37:03 (UTC)
  • 8.527°N 126.449°E
  • 32.8 km depth
Numerous aftershocks in the Mag 4+ to 5+ range.

M 6.4 - 47 km NE of Barcelona, Philippines​

https://earthquake.usgs.gov/earthquakes/eventpage/us7000lfi0/executive
  • 2023-12-02 16:03:43 (UTC)
  • 8.415°N 126.776°E
  • 64.3 km depth

7.6 magnitude earthquake strikes off the southern Philippines and a tsunami warning is issued
https://www.yahoo.com/news/7-6-magnitude-earthquake-strikes-151604517.html

The above earthquakes are near NW Mindanao, while an earlier strong earthquake was south of Mindanao.
https://www.physicsforums.com/threa...-philippines-off-s-coast-of-mindinao.1057405/
 

Attachments

  • M7.6_Earthquake_Mindinao(2Dec,2023).png
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  • M7.6,M6.4_Earthquake_Mindinao(2Dec,2023).png
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Last edited:
Earth sciences news on Phys.org
Numerous aftershocks

5.3 - Mindanao, Philippines
2023-12-02 12:02:02 (UTC-05:00)
59.0 km depth
5.7 59 km ENE of Barcelona, Philippines
2023-12-02 11:53:09 (UTC-05:00)
51.9 km depth
4.8 - 40 km NE of Barcelona, Philippines
2023-12-02 11:47:20 (UTC-05:00)
56.4 km depth
5.4 - Mindanao, Philippines
2023-12-02 11:34:58 (UTC-05:00)
58.3 km depth
5.1 - 41 km NE of Barcelona, Philippines
2023-12-02 11:34:26 (UTC-05:00)
53.8 km depth
4.7 - 38 km ENE of Hinatuan, Philippines
2023-12-02 11:33:40 (UTC-05:00)
52.4 km depth
5.7 - 40 km ENE of Barcelona, Philippines
2023-12-02 11:19:47 (UTC-05:00)
62.4 km depth
5.6 - 45 km ENE of Hinatuan, Philippines
2023-12-02 11:17:01 (UTC-05:00)
47.5 km depth
5.2 - 65 km ENE of Barcelona, Philippines
2023-12-02 11:13:22 (UTC-05:00)
53.1 km depth
 

Attachments

  • M7.6,M6.4_Aftershocks_Mindanao(2Dec,2023).png
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Yes, a major event shaking some of my in-laws awake. They are only 100km ( 60 miles) NW of the event.
This quake was a thrust faulting focal mechanism on a fault plane dipping to the WNW

1701568617741.png


from my seismograph ....
231202 1437UT M7.6 Mindanao, Phils zhi.gif
and a low gain sensor where the event phase arrivals can be more easily seen

231202 1437UT M7.6 Mindanao, Phils zlo1.gif
 
A lot of activity in that area. Two images show 95 and 99 earthquakes, including the 7.6 Mag. The most recent would be in red.
 

Attachments

  • M7.6,M6.4_Aftershocks_Mindanao(3Dec,2023).png
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  • M7.6,M6.4_Aftershocks_Mindanao(3Dec,2023)-2.png
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The aftershocks continue to roll in from offshore eastern Mindanao with multiple M6+
and several high M5 events.
The latest about 3 hours ago ( at the time of writing this), a M 6,9
being the strongest aftershock so far.

My gram shows the tail of the 7.6 which within are buried several M6.2's and a M6.0.

231202-03  UT M7.6, 5.8, 6.4, 6.2, 6.2, 6.0, 6.6, 5.8, 6.9 zhi.gif


Events M4.5 and up
231202-03 UT M  quakes so far, Mindanao.jpg


This is one of the most active aftershock sequences that I can recall from a M7.6 event.

cheers
Dave
 
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