Japan: two quakes, 6.7 and 6.8, at least 9 dead 900 inj

[Chacor]

Tsunami Warning/Advisory

Issued at 10:14 JST 16 Jul 2007

******************Headline******************
Tsunami Attension has been issued.
NIIGATA PREF.
*******************Text********************
Tsunami Advisory
<Tsunami Attention>
*NIIGATA PREF.,EXCEPT SADOGASHIMA ISLAND
*SADOGASHIMA ISLAND

At the following coasts (* marks) tsunamis are
expected to arrive right away.
NIIGATA PREF.,EXCEPT SADOGASHIMA ISLAND
SADOGASHIMA ISLAND

***********About Tsunami Forecast************
<Tsunami Attention>
Tsunami height is expected to be about 0.5 meters, Pay attention to tsunamis.

And the USGS:
Magnitude 6.7
# Date-Time Monday, July 16, 2007 at 01:13:27 (UTC)
= Coordinated Universal Time
# Monday, July 16, 2007 at 10:13:27 AM
= local time at epicenter
Time of Earthquake in other Time Zones
Location 37.584°N, 138.378°E
Depth 49 km (30.4 miles)
Region NEAR THE WEST COAST OF HONSHU, JAPAN
Distances 70 km (45 miles) WSW of Niigata, Honshu, Japan
105 km (65 miles) N of Nagano, Honshu, Japan
145 km (90 miles) NNW of Maebashi, Honshu, Japan
245 km (155 miles) NNW of TOKYO, Japan
Location Uncertainty horizontal +/- 7.4 km (4.6 miles); depth +/- 16.1 km (10.0 miles)
Parameters Nst=165, Nph=165, Dmin=927.5 km, Rmss=1.02 sec, Gp= 32°,
M-type=moment magnitude (Mw), Version=6
Source

USGS NEIC (WDCS-D)
http://earthquake.usgs.gov/eqcenter/rec ... 07ewac.php

[JonathanBelles]

Is a 6.7 big enough to produce a big tsunami? I see Tokyo felt it. First a TC and then an Earthquake, relation?

[Stephanie]

I know that Man Yi skirted the lower islands of Japan and not the western coast, but this is pretty ironic.

Fact - I think it depends upon how deep in the ocean and how the plates moved - like the one in Indonesia in 2005.

[JonathanBelles]

Tsunami Information NUMBER 1
(Estimated Tsunami Arrival Time and Height)

Issued at 10:15 JST 16 Jul 2007

Estimated Tsunami Arrival Time and Height

Tsunami Forecast Region Estimated Tsunami Arrival Time Estimated Tsunami Height
<Tsunami Attention>
NIIGATA PREF.,EXCEPT SADOGASHIMA ISLAND (*1) 0.5m
SADOGASHIMA ISLAND (*1) 0.5m

*1 mark:It is estimated that a tsunami has already arrived there.

Note the actual tsunamis can be higher than our estimation at some parts of the coasts.
No tsunami damage at some of the other coasts though there may be slight sea level changes.

Earthquake Information
Occurred at 10:13 JST 16 Jul 2007
Region name OFF JO-CHUETSU NIIGATA PREF
Latitude 37.5N
Longitude 138.6E
Depth about 10km
Magnitude 6.6

[Category 5]

Any updates?

[Chacor]

The advisory has now been ended.

[Cookiely]

One of the Japanese nuclear reactors caught fire and smoke is billowing from the reactor. Sounds like when they scrambled an electrical fire started.

[AussieMark]

generally you see tsunami with quakes over 7.0 with the huge tsunami with ones at least 7.5-8.0.

The 1998 Papua New Guinea Tsunami was triggered by a 7.1 quake
the 2004 Sumatra one was triggered by a 9.0 - 9.3
2006 Java one a 7.7.

Just from my readings it seems a 7.1 or so seems to be the minimum.

[TexasStooge]

I saw this story on the news this morning. The earthquake looks tragic itself, but thank goodness no Tsunami was produced.

[Chacor]

Latest: 7 dead, over 800 injured.

[Regit]

AP is reporting a new 6.6 earthquake has just struck the same general area.

[angelwing]

Just saw that on CNN, heck of an aftershock!

[Chacor]

I can only find 5.7 (6 hours ago) and 4.6 (two hours ago) aftershocks on the USGS maps.

[Chacor]

JMA has it:

Earthquake Information (Information about Seismic Intensity at each site)
Issued at 23:31 JST 16 Jul 2007

Occurred at (JST) Latitude
(degree) Longitude
(degree) Depth Magnitude Region Name
23:18 JST 16 Jul 2007 36.8N 135.2E 370km 6.6 OFF KYOTO PREF

[angelwing]

http://www.emsc-csem.org/index.php?page ... l&id=50124

6.8 according to the above

[Chacor]

Another smaller aftershock just hit...

Earthquake Information (Information about Seismic Intensity at each site)
Issued at 23:55 JST 16 Jul 2007

Occurred at (JST) Latitude
(degree) Longitude
(degree) Depth Magnitude Region Name
23:50 JST 16 Jul 2007 37.6N 138.7E 10km 3.3 OFF JO-CHUETSU NIIGATA PREF

[chadtm80]

wow.. Double whammy for them

[JonathanBelles]

Im seeing two separate quakes, the 6.7 and the 6.8 with numerous aftershocks for each.

[Stephanie]

Those poor people!

[HurricaneBill]

generally you see tsunami with quakes over 7.0 with the huge tsunami with ones at least 7.5-8.0.

The 1998 Papua New Guinea Tsunami was triggered by a 7.1 quake
the 2004 Sumatra one was triggered by a 9.0 - 9.3
2006 Java one a 7.7.

Just from my readings it seems a 7.1 or so seems to be the minimum.

I think I read somewhere that the 1998 PNG tsunami was caused by an underwater landslide that was triggered by the earthquake.