[JBaymore]

An aftershock / quake in the past hour on Hokkaido.

Magnitude 4.7 - HOKKAIDO, JAPAN REGION
2011 April 17 03:00:00 UTC
Magnitude 4.7
Date-Time Sunday, April 17, 2011 at 03:00:00 UTC
Sunday, April 17, 2011 at 12:00:00 PM at epicenter

Location 42.357°N, 140.279°E
Depth 75.5 km (46.9 miles)
Region HOKKAIDO, JAPAN REGION
Distances 76 km (47 miles) NNW (330°) from Hakodate, Hokkaido, Japan
119 km (74 miles) SW (228°) from Sapporo, Hokkaido, Japan
173 km (108 miles) NNW (348°) from Aomori, Honshu, Japan
745 km (463 miles) N (3°) from TOKYO, Japan

Location Uncertainty
horizontal +/- 26.9 km (16.7 miles); depth +/- 12 km (7.5 miles)
Parameters
NST= 30, Nph= 31, Dmin=241.6 km, Rmss=1.39 sec, Gp=115°,
M-type=body wave magnitude (Mb), Version=8

Source U.S. Geological Survey, National Earthquake Information Center:
World Data Center for Seismology, Denver
Event ID usc0002t94



And another one in the same timeframe off the coast near the 3/11 epicenter:

Magnitude 4.7 - OFF THE EAST COAST OF HONSHU, JAPAN
2011 April 17 02:56:00 UTC
Magnitude 4.7
Date-Time Sunday, April 17, 2011 at 02:56:00 UTC
Sunday, April 17, 2011 at 12:56:00 PM at epicenter

Location 40.035°N, 143.267°E
Depth 29 km (18.0 miles)
Region OFF THE EAST COAST OF HONSHU, JAPAN
Distances 161 km (100 miles) ESE of Hachinohe, Honshu, Japan
185 km (114 miles) ENE of Morioka, Honshu, Japan
231 km (143 miles) ESE of Aomori, Honshu, Japan
573 km (356 miles) NNE of TOKYO, Japan

Location Uncertainty
horizontal +/- 19.6 km (12.2 miles); depth +/- 6.9 km (4.3 miles)
Parameters NST= 34, Nph= 34, Dmin=220.4 km, Rmss=0.8 sec, Gp=137°,
M-type=body wave magnitude (Mb), Version=5
Source USGS NEIC (WDCS-D)
Event ID usc0002t8y