Tonga Islands    2012.04.02-08:17:06.29    mb:5.3    Mwp:-    Mwpd:-    WL:- GREY

Earthquake details:
Magnitude: mb: 5.3 [28]    Mwp: - [0]    Mwpd: - [0]
Region: Tonga Islands
Origin Time: 2012.04.02-08:17:06.29 UTC
Hypocenter: lat: -16.87°  lon: -173.39°   [+/-15km]    depth: 20km   [+/-16km]
Location Quality: stdErr:2.6s   assocPhases: 58   usedPhases: 53
minDist: 3.3°   maxDist: 153.6°   AzGap: 60°   2ndAzGap: 72°
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 11km   maxHorUnc: 15km   azMaxHorUnc: 119°
68%ConfEllipsoid:   semiMajorAxisLength: 18km   majorAxisAzimuth: 300°   majorAxisPlunge: 12°   semiIntermediateAxisLength: 15km   intermediateAxisAzimuth: 87°   intermediateAxisPlunge: 75°   semiMinorAxisLength: 13km
Tsunamigeneic Assesment:
Discriminants: T50Ex: 0.4 [29]    Td: - [0]    WL: - [0] GREY    T0: 12.9 [25]
Tsunami evaluation: not available (Td*T50Ex Warning Level: GREY )
    (DISCLAIMER: Tsunamigenic evaluation is based on the value of the Td*T50Ex Warning Level. This evaluation only concerns the likelihood that this earthquake generated a regional or larger scale tsunami. This evaluation DOES NOT concern the size and effects of a possible tsunami, which depend on details of the earthquake source, ocean bathymetry, coastal distances and population density, and many other factors.) This evaluation DOES NOT apply to and DOES NOT EXCLUDE the possibility that this earthquake generated a local tsunami, which can be destructive along coasts within a 100 km or more from the earthquake epicenter.

First-motion Focal Mechanism:    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 66°   dip: 77°   rake: -170°
Nodal Plane 2: strike: 273°   dip: 87°   rake: -137°
Quality: azimuthalGap: 60°   stationPolarityCount: 42   misfit: 0.32   stationDistributionRatio: 0.56   qualityCode: D
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2

Event ID: 1333354630723
Event info last updated: 2012.04.02-09:18:03 UTC
Event first association/location: 2012.04.02-08:22:01 UTC
Software: Early-est 1.0.3 (2011.12.06)
Agency: INGV