7.3 quake hits Philippines (upgrade from 6.9) VERY deep

reply to post by PuterMan


Wow so now there are 3 7.0+ Quakes all in the same area? I hope everything is okay, and nobody is hurt.

Well, errrm, WOW - I haven't ever seen so many hi-mag quakes in quick succession before... is this potential pre-cursor to volcanic activity?

Okay, so those friends of mine that like to brainstorm:

Take a look at this list:


MAP 4.7 2010/07/23 01:57:10 -17.814 -178.663 592.6 FIJI REGION
MAP 5.3 2010/07/17 16:20:02 -15.551 -175.084 10.2 TONGA
MAP 4.8 2010/07/17 04:34:00 -20.610 -178.897 608.4 FIJI REGION


Do you notice a similarity?

Check out the recent quake map of the world: HERE

You could pretty much draw a straight line from the FIJI quakes to the Philippine quakes. They are almost the exact depth.


Coincidence? I don't think so!!!!!

Here is a pic of the earth again, showing the different layers and depth, incase anyone missed it. I think it is very important to understand how deep these are.

(Preliminary magnitude — update expected within 15 minutes)

Magnitude 5.7 - NORTHERN SUMATRA, INDONESIA
2010 July 24 02:11:28 UTC

This event has been reviewed by a seismologist.
Magnitude 5.4 - NORTHERN SUMATRA, INDONESIA
2010 July 24 02:11:25 UTC

Location
0.995°N, 99.524°E
Depth
38.1 km (23.7 miles)
Region
NORTHERN SUMATRA, INDONESIA
Distances
112 km (70 miles) SE (134°) from Sibolga, Sumatra, Indonesia
220 km (137 miles) WNW (283°) from Pekanbaru, Sumatra, Indonesia
235 km (146 miles) NNW (337°) from Padang, Sumatra, Indonesia
339 km (211 miles) SW (226°) from KUALA LUMPUR, Malaysia
Location Uncertainty
horizontal +/- 7.6 km (4.7 miles); depth +/- 10.3 km (6.4 miles)
Parameters
NST= 60, Nph= 60, Dmin=184.2 km, Rmss=1.32 sec, Gp= 76°,
M-type=body wave magnitude (Mb), Version=7
Source
U.S. Geological Survey, National Earthquake Information Center:
World Data Center for Seismology, Denver
Event ID
us2010zcal

[edit on 23-7-2010 by berkeleygal]

reply to post by berkeleygal


Okay, so she's starting to exhale?


MAP 3.9 2010/07/24 02:29:41 32.718 -115.987 3.2 SOUTHERN CALIFORNIA
MAP 5.4 2010/07/24 02:11:26 0.995 99.524 38.1 NORTHERN SUMATRA, INDONESIA
MAP 5.3 2010/07/24 01:44:44 6.622 123.700 592.2 MORO GULF, MINDANAO, PHILIPPINES
MAP 4.9 2010/07/24 00:50:14 6.565 123.642 581.5 MORO GULF, MINDANAO, PHILIPPINES



--------------------------------------------------------------------------------
MAP 7.4 2010/07/23 23:15:09 6.749 123.268 616.7 MORO GULF, MINDANAO, PHILIPPINES
MAP 7.6 2010/07/23 22:51:12 6.494 123.533 576.3 MORO GULF, MINDANAO, PHILIPPINES
MAP 5.4 2010/07/23 22:19:36 6.764 123.545 594.8 MORO GULF, MINDANAO, PHILIPPINES
MAP 7.3 2010/07/23 22:08:11 6.708 123.479 604.5 MORO GULF, MINDANAO, PHILIPPINES




I expect to see something bigger opposite soon.

[edit on 23-7-2010 by westcoast]

Aren't deep quakes usually associated with subduction zones where the subducting plates are pushed further down into the asthenosphere... if that's the case then there's got to be a reaction whether it's a release or movement of matter being replaced by the subducting matter (volcanic action?) or a similarly large event on a corresponding plate?

Originally posted by MoorfNZ
Aren't deep quakes usually associated with subduction zones where the subducting plates are pushed further down into the asthenosphere... if that's the case then there's got to be a reaction whether it's a release or movement of matter being replaced by the subducting matter (volcanic action?) or a similarly large event on a corresponding plate?

BINGO!!!!


second line 'cause I gotta

reply to post by MoorfNZ


That would be just it :-)

Text

When i looked at USGS a few hours ago when first large quake happened The quake count was around the 500s Now it is up around 830s Yet listed quakes for 23 / 24th is + say 35 quakes, Did i miss somthing or did i loose track of volume,
Regards, robbo

reply to post by westcoast


As I said

but is on the subduction zone/fault.

however, whilst the one on the 21st is in the zone these are not. Take a look at the map I put up. They could be affected by the subduction zone depending on the angle of the subduction in this area, but I find it strange that they are all in the same spot. If this was a section of lithosphere 'slipping under' then I would have expected a sightly large spread I think. I am thinking of the Chilean quakes where they were spread over quite a large area up and down the coast.

The largest distance between these is 31 miles and the shortest around 9 miles. I think someone suggested volcanic and the possibility of setting of the volcanoes close by, but could we be looking at the start of a new undersea mount? It could be some time before that was known as it is so deep there, remember we are talking around 14,000 ft of water. The pressure alone would be enough to contain much of any volcanic output.

Just a thought. I am off to my bed! (PS 5.4 near Toba now!)

[Parting shot]

Cumulative 4.5+ over the past 7 days



[edit on 23/7/2010 by PuterMan]

Originally posted by westcoast
HOLY CRAP!!!!! What is going on?????



MAP 7.2 2010/07/23 23:15:09 6.770 123.350 614.0 MORO GULF, MINDANAO, PHILIPPINES
MAP 7.4 2010/07/23 22:51:12 6.482 123.533 575.6 MORO GULF, MINDANAO, PHILIPPINES
MAP 5.4 2010/07/23 22:19:36 6.764 123.545 594.8 MORO GULF, MINDANAO, PHILIPPINES
MAP 7.3 2010/07/23 22:08:11 6.708 123.479 604.5 MORO GULF, MINDANAO, PHILIPPINES

I thank you for posting these numbers. I admit, I am just a "reader". I am reminded of a thread I read about earthquakes in California on the 15th of June this year. I was horrified and the bigest quake was over 7.0. Thread #583576

It was all different the next day. It was exactly the same wording with lowered numbers. This has haunted me since.

I just hope to see the same numbers tommorrow!

cmariesees






LINK

Originally posted by cmariesees

Originally posted by westcoast
HOLY CRAP!!!!! What is going on?????



MAP 7.2 2010/07/23 23:15:09 6.770 123.350 614.0 MORO GULF, MINDANAO, PHILIPPINES
MAP 7.4 2010/07/23 22:51:12 6.482 123.533 575.6 MORO GULF, MINDANAO, PHILIPPINES
MAP 5.4 2010/07/23 22:19:36 6.764 123.545 594.8 MORO GULF, MINDANAO, PHILIPPINES
MAP 7.3 2010/07/23 22:08:11 6.708 123.479 604.5 MORO GULF, MINDANAO, PHILIPPINES

I thank you for posting these numbers. I admit, I am just a "reader". I am reminded of a thread I read about earthquakes in California on the 15th of June this year. I was horrified and the bigest quake was over 7.0. Thread #583576

It was all different the next day. It was exactly the same wording with lowered numbers. This has haunted me since.

I just hope to see the same numbers tommorrow!

cmariesees

No, honestly, I would be happy to wake up tommorrow to have the numbers lowered as well as the damage report!

cmariesees






LINK

The depth/magnitude combination in this region is unprecedented, at least going back 139 years, to 1871.

Thats as far back as I can get any data from Dr. Tokuji Utsu's Catalog of Damaging Earthquakes in the World and NEIC.
Heres the list of historical 7+ Magnitude quakes I complied and have converted to a Map.
The dates and magnitudes are in the left hand column for reference.
I didn't put in todays (yesterdays UTC) quakes as I'm not convinced they will all stand investigation as Mag 7+, perhaps the 7.6 may, but the others I think will get downgraded to >7.0.
Notice how it has been 8 years since a 7+ quake in the Philippines?, well to me based on the history, they were long overdue for one (so they got 3 at once to catch up)

Good to hear no one got hurt and no reports of damage.

Interesting information gleaned from a commenter on Eruptions blog ref. Moro Gulf region.

The 1976 August 16, Mindanao, Philippine earthquake (Msw 7.8) — evidence for a subduction zone south of Mindanao. Geophys. J Royal Astronom. Soc. 57:51 - 65 Summary. The Philippine earthquake of 1976 August 16, is one of the largest to have occurred world-wide in recent years (Mw=8.8; Ms=7.8; seismic moment, Mo= 1.9 × 1028dyne-cm). It is, however, associated not with the Philippine Trench, which is the dominant tectonic feature along the eastern Philippine Islands, but with a much less prominent trench system in the Moro Gulf, North Celebes Sea, south of Mindanao. In this area most of the seismicity is at depths greater than 500 km, associated with the westward dipping Benioff zones of the Sangihe and Mindanao arc systems. This event, however, has a shallow focus and caused a locally destructive tsunami. ...Bathymetric data indicate the presence of a trench striking north-south in the region of the Moro Gulf, and seismic reflection profiling indicates disturbed sediments east of the trench showing evidence for subduction. In addition, the geological structures mapped on the island of Mindanao are consistent with this mode of deformation. The only other known large earthquake in the region on 1918 August 15 (Ms=8.0) probably occurred along the same subduction zone, on an adjacent segment, to the south of the recent event. Note the dates. It is also instructive to recall that the large EQ under Granada Spain in April 2010 was also very deep, at ~630Km (estimated by IGNV, USGS and Harvard). A previous deep quake hit the same location in 1954, also at a deep depth of ~650Km.

scienceblogs.com...

This unusual event will probably give scientists a great deal of new information into the structure of Earth's core. I am surprised that news hasn't covered this a great deal more.

It seems a continuation of the large number or quakes in the last year.

I'm 37 km. from General Santos City and I was still asleep when the quakes struck. Didn't bother to get out of bed. I recorded four shakings (that I can remember.) And I think another weak one occured just 5 minutes ago (1:36 PM local time) though I can't be sure if it was just my imaginings.

reply to post by eldard



You're right - you did just feel another one.. THREE in fact

MAP 6.3 2010/07/24 05:35:03 6.372 122.670 471.0 MORO GULF, MINDANAO, PHILIPPINES

MAP 6.7 2010/07/24 05:35:02 6.210 123.710 561.0 MORO GULF, MINDANAO, PHILIPPINES


Magnitude 4.4
Date-Time

* Saturday, July 24, 2010 at 05:01:38 UTC
* Saturday, July 24, 2010 at 01:01:38 PM at epicenter

Location 6.886°N, 123.853°E
Depth 597.5 km (371.3 miles)
Region MORO GULF, MINDANAO, PHILIPPINES
Distances

* 58 km (36 miles) SW (229°) from Cotabato, Mindanao, Philippines
* 112 km (70 miles) SSE (160°) from Pagadian, Mindanao, Philippines
* 170 km (106 miles) WNW (300°) from General Santos, Mindanao, Philippines
* 916 km (569 miles) SSE (160°) from MANILA, Philippines

[edit on 24-7-2010 by MoorfNZ]

The two 6+'s have been revised to:

Magnitude 6.2
Date-Time

* Saturday, July 24, 2010 at 05:35:01 UTC
* Saturday, July 24, 2010 at 01:35:01 PM at epicenter

Location 6.194°N, 123.596°E
Depth 563.9 km (350.4 miles)
Region MORO GULF, MINDANAO, PHILIPPINES
Distances

* 136 km (85 miles) SSW (212°) from Cotabato, Mindanao, Philippines
* 176 km (109 miles) W (273°) from General Santos, Mindanao, Philippines
* 183 km (113 miles) S (177°) from Pagadian, Mindanao, Philippines
* 965 km (600 miles) E (81°) from BANDAR SERI BEGAWAN, Brunei

I had to step back into the 'real' world for awhile....I see things have gotten a bit more interesting!

Here is the latest:

MAP 6.2 2010/07/24 05:35:02 6.194 123.596 563.9 MORO GULF, MINDANAO, PHILIPPINES
MAP 4.4 2010/07/24 05:01:38 6.886 123.853 597.5 MORO GULF, MINDANAO, PHILIPPINES
MAP 3.1 2010/07/24 03:05:39 32.614 -115.692 11.3 BAJA CALIFORNIA, MEXICO
MAP 3.9 2010/07/24 02:29:41 32.718 -115.987 3.2 SOUTHERN CALIFORNIA
MAP 5.4 2010/07/24 02:11:26 0.995 99.524 38.1 NORTHERN SUMATRA, INDONESIA
MAP 5.3 2010/07/24 01:44:44 6.622 123.700 592.2 MORO GULF, MINDANAO, PHILIPPINES
MAP 4.9 2010/07/24 00:50:14 6.565 123.642 581.5 MORO GULF, MINDANAO, PHILIPPINES



--------------------------------------------------------------------------------
MAP 7.4 2010/07/23 23:15:09 6.749 123.268 616.7 MORO GULF, MINDANAO, PHILIPPINES
MAP 7.6 2010/07/23 22:51:12 6.494 123.533 576.3 MORO GULF, MINDANAO, PHILIPPINES
MAP 5.4 2010/07/23 22:19:36 6.764 123.545 594.8 MORO GULF, MINDANAO, PHILIPPINES
MAP 7.3 2010/07/23 22:08:11 6.708 123.479 604.5 MORO GULF, MINDANAO, PHILIPPINES


I think that a subduction zone makes the most sense. If this is the case, I think these quakes indication some MAJOR movement and we may see a lot more before it is over.