Earthquake with magnitude of mb 4.2 on date 20-05-1985 and time 20:11:43 (UTC) in region Tirreno Meridionale (MARE)

A magnitude mb 4.2 earthquake occured in region: Tirreno Meridionale (MARE), on

  • 20-05-1985 20:11:43 (UTC)
  • 20-05-1985 22:11:43 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 38.72, 14.7 at 230 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

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Malfa ME 20 982 982

Municipalities with at least 50000 inhabitants

An earthquake occurred to
95 Km NW of Messina (238439 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 mb 4.2 1985-05-20
20:11:43
38.72 14.7 230 2013-07-15
08:40:51
Bollettino Sismico Italiano INGV 6889
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1985-05-20 20:11:43 ± 1.329
Latitude 38.72 ± 0.05
Longitude 14.70 ± 0.07
Depth (km) 230 ± 15 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 6889

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) 8056.3
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 103
Number of associated phases, regardless of their use for origin computation 13
Number of defining phases 13
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.4
Epicentral distance of station closest to the epicenter (degree) 0.00753
Epicentral distance of station farthest from the epicenter (degree) 0.07828
Number of stations at which the event was observed 13
Number of stations from which data was used for origin computation 13
Magnitude information

mb:4.2

Field Value
Value 4.2
Uncertainty
Num. used stations
Type of magnitude mb
Reference to an origin 6889
Agency INGV
Autore ISC
Time of creation (UTC) 2013-01-09 08:06:18
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.BN9.Z. 1985-05-20T20:13:49.00 10.0 undecidable manual P 318 0.0783 -0.51 0.9
--.STV.Z. 1985-05-20T20:13:35.00 10.0 undecidable manual P ! 317 0.0703 -2.63 0
--.ROB.Z. 1985-05-20T20:13:35.20 10.0 undecidable manual P 319 0.0681 0.95 0.4
--.RBL.Z. 1985-05-20T20:13:31.00 10.0 undecidable manual P ! 353 0.0698 -5.98 0
--.PCN.Z. 1985-05-20T20:13:31.00 10.0 undecidable manual P 330 0.0661 -0.43 1.1
--.TRI.Z. 1985-05-20T20:13:20.50 10.0 undecidable manual P ! 354 0.0631 -6.45 0
--.ORI.Z. 1985-05-20T20:12:23.00 10.0 undecidable manual P 44 0.017 -1.09 0.3
--.FA1.Z. 1985-05-20T20:12:22.50 10.0 undecidable manual P 209 0.0149 0.5 1.3
--.PA1.Z. 1985-05-20T20:12:22.00 10.0 undecidable manual P 173 0.0152 -0.33 1.6
--.CSI.Z. 1985-05-20T20:12:22.50 10.0 undecidable manual P 48 0.0146 0.83 0.7
--.ROI.Z. 1985-05-20T20:12:22.40 10.0 undecidable manual P 58 0.0151 0.27 3.4
--.GIB.Z. 1985-05-20T20:12:16.00 10.0 undecidable manual P 215 0.0081 -0.38 1.5
--.MSI.Z. 1985-05-20T20:12:16.00 10.0 undecidable manual P 127 0.0075 -0.05 1.9
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
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