Earthquake with magnitude of Md 2.8 on date 21-09-2004 and time 02:43:41 (UTC) in region Tirreno Meridionale (MARE)

A magnitude Md 2.8 earthquake occured in region: Tirreno Meridionale (MARE), on

  • 21-09-2004 02:43:41 (UTC)
  • 21-09-2004 04:43:41 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 38.75, 15.55 at 23 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

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.

Municipalities within 20 km from the epicenter

No Italian municipalities within 20 km distance.

Municipalities with at least 50000 inhabitants

An earthquake occurred to
62 Km N of Messina (238439 inhabitants)
71 Km W of Lamezia Terme (70714 inhabitants)
71 Km N of Reggio di Calabria (183035 inhabitants)
86 Km SW of Cosenza (67546 inhabitants)
92 Km W of Catanzaro (90612 inhabitants)
Recent and historical Seismicity
Seismic hazard
Shakemap
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Rev 1000 Md 2.8
ML-VAX 2.0
2004-09-21
02:43:41
38.75 15.55 23 2013-07-15
08:40:51
Bollettino Sismico Italiano INGV 505269
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2004-09-21 02:43:41 ± 0.154
Latitude 38.75 ± 0.01
Longitude 15.55 ± 0.02
Depth (km) 23 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 505269

Uncertainty

Field Value
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) 1869.5
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 108
Number of associated phases, regardless of their use for origin computation 8
Number of defining phases 8
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.2
Epicentral distance of station closest to the epicenter (degree) 0.00453
Epicentral distance of station farthest from the epicenter (degree) 0.01319
Number of stations at which the event was observed 7
Number of stations from which data was used for origin computation 7
Magnitudes information

Md:2.8

Field Value
Value 2.8
Uncertainty
Num. used stations 3
Type of magnitude Md
Reference to an origin 505269
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-05 01:03:32

ML:2

Field Value
Value 2
Uncertainty
Num. used stations 7
Type of magnitude ML
Reference to an origin 505269
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2015-04-28 13:07:13
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.SOI.Z. 2004-09-21T02:44:08.47 10.0 undecidable manual SN 149 0.007 0.49 0.1
--.ORI.Z. 2004-09-21T02:44:06.34 10.0 undecidable manual PN 27 0.0132 0.09 0.9
--.MGR.Z. 2004-09-21T02:44:04.80 10.0 undecidable manual PN 0 0.0125 -0.31 0.5
--.TDS.Z. 2004-09-21T02:44:00.85 10.0 undecidable manual PN 33 0.0098 -0.23 0.8
--.SOI.Z. 2004-09-21T02:43:56.77 10.0 positive manual PN 149 0.007 0.02 2.4
--.GRI.Z. 2004-09-21T02:43:55.77 10.0 undecidable manual PG 83 0.0061 0.44 0.3
--.SLNA.Z. 2004-09-21T02:43:53.93 10.0 positive manual PG 251 0.0053 0.19 1.9
--.SCLL.Z. 2004-09-21T02:43:51.89 10.0 positive manual PG 165 0.0045 -0.33 1.1
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
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