Quake Watch 2015

a reply to: SeekingDepth

As usual USGS down graded both.

6.2 to 6.1

6.5 to 6.0

EMSC is even showing lower for both 5.9 and 5.5

a reply to: PuterMan
No I'm not getting any EMSC data on the download

a reply to: lurksoften
Even so, those are pretty big aftershocks of a 6.3/6.4
they may come down below 6.0 on USGS, the CWB (Taiwan) link shows this already (although they are in ML)
USGS are so inconsistent, the scientific summaries show;
6.4mww=6.3mwb
6.0mww=5.8mwb
6.1mww=6.0mwc


why do 2 in mwb and one in mwc?

The Aussies at least stick to the same magnitude types,
6.47mwp=6.02mb
6.0mwp=5.69mb
6.1mwp=5.99mb

even the Russians are consistent;
Ms 6.5=mb 6.3
Ms 5.8=mb 5.7
Ms 6.0=mb 5.8
www.ceme.gsras.ru...



JMA were pretty slow to get their data up, nothing on last night when I looked (NZST)
now showing (local time);
10:43 JST 20 Apr 2015 Yonagunijima Kinkai M6.8
20:45 JST 20 Apr 2015 Yonagunijima Kinkai M5.9
21:00 JST 20 Apr 2015 Yonagunijima Kinkai M6.4
www.jma.go.jp...



will have to wait until tomorrow to get the official JMA magnitudes from the Unified Hypocenter Catalog, the Preliminary NIED Catalog does not cover south of the Satsunan Islands (south of Kyushu)

For something a little different.
Remember the PNW Tremor pages that were popular for a while in years gone by? pnsn.org...
Seems Japan has the same phenomenon, NIED are running a page on Epicentral distribution of deep low-frequency tremor in southwest Japan.

Daily epicentral distribution of deep low-frequency tremor. Red circles are centroid locations obtained by a clustering method of hourly tremor activity (Obara et al., 2010), which is located by a hybrid analysis using envelope correlation and amplitude (Maeda and Obara, 2009).

here is their map for 19.04.2015JST


I ran the reviewed data from JMA below M1 through ikiBing and here's the results, matches perfectly
muzzys japan tremors map 19.04.2015 JST

its not all just about the big ones!

Just stopping by long enough to wish Mr. PuterMan a HAPPY BIRTHDAY!!!
Hope it's the best one yet!

Quakes seem to have settled down,
but still some midlevel perking going on.
(Gratuitous quake reference to stay on topic!)
WOQ

M4.1 - 163km S of Masset, Canada

Nearby Cities

163km (101mi) S of Masset, Canada
217km (135mi) SSW of Prince Rupert, Canada
301km (187mi) SW of Terrace, Canada
534km (332mi) NW of Campbell River, Canada
660km (410mi) SSE of Juneau, Alaska
earthquake.usgs.gov...

a reply to: muzzy
Just to add some more confusion with other types of magnitude readings.
Data in from JMA;
6.8 MLD (6.4MLV)
6.0 MLD (5.7MLV)
6.4 MLD (5.7MLV)
D : Magnitude calculated using displacement.
V : Magnitude calculated using velocity.
Normally all JMA data is given in Velocity.

JMA are claiming these as NW OFF ISHIGAKIJIMA IS although they are actually WSW of Ishigaki Island.

ikiBingmap here

22 aftershocks to 20/04/2015 12:23:09 UTC

a reply to: muzzy

So what are you thinking muzzy?

Could these be foreshocks?

a reply to: crappiekat
not sure, every region is different of course, but as I said those were pretty big aftershocks, and generally there haven't been many of a lower number all up for such a strong quake.
That 1999 series shown on the graph (previous page)
went 7.7, 6.3, 6.6, 6.1, 6.8, 6.4, 6.4, 6.5 which is the "normal" deteriorating sequence
maybe this one is the same, just a bit denser between magnitudes
there doesn't seem to be any precedence for increasing magnitude when it comes to Tawian Region, especially in the short term.

pretty well self explanatory

Clifford Bay again! (see 2013)
I didn't feel it, was driving at the time, lots of others did.

Public ID 2015p302557
Intensity strong
Universal Time April 22 2015, 22:42:42
NZ Standard Time Thu, Apr 23 2015, 10:42:42 am
Depth 24 km
Magnitude 5.1
Location 15 km east of Seddon
Latitude, Longitude -41.67, 174.26
Agency WEL(GNS_Primary)
Status reviewed
2915 felt reports

www.geonet.org.nz...

will probably get overshadowed by this one

F-E Region: Santa Cruz Islands
Time: 2015-04-22 22:57:21.2 UTC
Magnitude: 6.0
Epicenter: 166.44°E 12.10°S
Depth: 113 km
Status: A - automatic
geofon.gfz-potsdam.de...

a reply to: muzzy
would have been nice to be able to edit that post, as its only been 3.5hrs (not 4hrs like the message says) but never mind.
couple of maps Cook Strait M5.15 and aftershocks


the yellow orb is the 4.4 foreshock, foreshocks are rare in NZ. Could be more to come, the 2013 series started low.
interactive Topo

Quake swarm alert !


38.804°N 122.773°W


The Geysers, California

www.latimes.com...

I thought someone already posted something along these lines but can't find it. So, if I'm duplicating, sorry.

Also, the USGS, released a report on the fracking earthquakes. PBS and NPR has stories. I didn't pay attention. Of course, I am angry, but I don't want to research a dead horse. It is obvious. Luckily, Oklahoma's ancient faults have only produced one major quake. A feared bigger one may not happen. MAY. Not. I'm still not convince a nearby fault might break. New Madrid???

originally posted by: ericblair4891
www.latimes.com...

I thought someone already posted something along these lines but can't find it. So, if I'm duplicating, sorry.

Also, the USGS, released a report on the fracking earthquakes. PBS and NPR has stories. I didn't pay attention. Of course, I am angry, but I don't want to research a dead horse. It is obvious. Luckily, Oklahoma's ancient faults have only produced one major quake. A feared bigger one may not happen. MAY. Not. I'm still not convince a nearby fault might break. New Madrid???

Yes one day The New Madrid Fault will break

M5.5 - 211km W of Ferndale, California

Time
2015-04-24 01:34:59 (UTC)
2015-04-23 20:34:59 (UTC-05:00)

Nearby Cities
211km (131mi) W of Ferndale, California
220km (137mi) W of Fortuna, California
222km (138mi) W of Eureka, California
230km (143mi) W of Arcata, California
497km (309mi) WNW of Sacramento, California

USGS

This one kinda caught my interest also 4.1 Idaho

a reply to: lurksoften

I was just going to post the Idaho one.

There has also been:

M5.3 - 80km SW of Atka, Alaska
earthquake.usgs.gov...

All 3 within 2 hours.

A nice wee earthquake in ChCh right now. Biggest for a while it seems, and went on for about 15 seconds.

Great :/

Geonet

6.3, NW of Kaikoura. Probably on the Clarence Fault.

Awesome, I'm going to be in Wellington this weekend. Hope it settles down!

went on for ages that one! Suprised it was felt so much being so deep.
a reply to: aorAki

a reply to: grantbeed


Yeah, when I saw the depth I questioned it at first! It did go on a bit too aye!

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