A magnitude Mw 7.4 earthquake occured in region: Tonga [Sea], on
and geographic coordinates (lat, lon) -23.02, -177.11 at 171 km depth.
The earthquake was located by: Sala Sismica INGV-Roma.
Search earthquakes: Any within 30 km radius
The values of hypocentral coordinates and magnitude may be revised at a later time as more information becomes available.
No Italian municipalities within 20 km distance.
No Italian municipalities within 100 km from the epicenter with at least 50000 inhabitants.
|Type||Magnitude||Date and Time (UTC)||Latitude||Longitude||Depth (km)||Published time (UTC)||Author||Location ID|
|Sala Sismica INGV-Roma||3581891|
|Time (UTC)||2013-05-23 17:19:04|
|Depth (km)||171 (from location)|
|Evaluation mode of Origin||manual|
|Evaluation status of Origin||reviewed|
|Version||200 -> AGENDA-INGV|
|Preferred uncertainty description||horizontal uncertainty|
|Semi-major axis of confidence ellipse (meter)|
|Semi-minor axis of confidence ellipse (meter)|
|Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi)|
|Circular confidence region, given by single value of horizontal uncertainty (meter)||11000|
|Confidence level of the uncertainty (%)||68|
|Largest azimuthal gap in station distribution as seen from epicenter (degree)||71|
|Number of associated phases, regardless of their use for origin computation||1|
|Number of defining phases||1|
|RMS of the travel time residuals of the arrivals used for the origin computation (sec)|
|Epicentral distance of station closest to the epicenter (degree)|
|Epicentral distance of station farthest from the epicenter (degree)|
|Number of stations at which the event was observed||0|
|Number of stations from which data was used for origin computation||0|
|Num. used stations|
|Type of magnitude||Mw|
|Reference to an origin||3581891|
|Autore||Sala Sismica INGV-Roma|
|Time of creation (UTC)||2013-05-23 17:51:18|