Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of Md 3.4 on date 21-01-1985 and time 11:55:31 (UTC) in region Tirreno Meridionale (MARE)

A magnitude Md 3.4 earthquake occured in region: Tirreno Meridionale (MARE), on

  • 21-01-1985 11:55:31 (UTC)
  • 21-01-1985 12:55:31 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 38.56, 15.47 at 215 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.

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Municipalities within 20 km from the epicenter

No Italian municipalities within 20 km distance.

Municipalities with at least 50000 inhabitants

An earthquake occurred to
41 Km N of Messina (238439 inhabitants)
52 Km N of Reggio di Calabria (183035 inhabitants)
87 Km SW of Lamezia Terme (70714 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
Bulletin
Rev1000 		Md 3.4 1985-01-21
11:55:31		 38.56 15.47 215 2013-07-15
08:40:51		 Bollettino Sismico Italiano INGV 699
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1985-01-21 11:55:31 ± 1.361
Latitude 38.56 ± 0.05
Longitude 15.47 ± 0.07
Depth (km) 215 ± 13 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 699

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) 8393.9
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 109
Number of associated phases, regardless of their use for origin computation 33
Number of defining phases 33
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.8
Epicentral distance of station closest to the epicenter (degree) 0.00283
Epicentral distance of station farthest from the epicenter (degree) 0.07269
Number of stations at which the event was observed 28
Number of stations from which data was used for origin computation 28
Magnitude information

Md:3.4

Field Value
Value 3.4
Uncertainty
Num. used stations 2
Type of magnitude Md
Reference to an origin 699
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:05:56
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.ROB.Z. 1985-01-21T11:57:33.70 10.0 undecidable manual P 317 0.0727 4.91 0.2
--.IMP.Z. 1985-01-21T11:57:32.50 10.0 undecidable manual P 315 0.0703 7.29 0
--.FIN.Z. 1985-01-21T11:57:30.80 10.0 undecidable manual P 318 0.0705 5.23 0.2
--.LCI.Z. 1985-01-21T11:56:55.20 10.0 undecidable manual S 48 0.0243 0.52 0.5
--.PE1.Z. 1985-01-21T11:56:54.00 10.0 undecidable manual S 33 0.0243 -0.64 0.3
--.AS1.Z. 1985-01-21T11:56:47.50 10.0 undecidable manual P 335 0.0448 -0.24 0.6
--.SGO.Z. 1985-01-21T11:56:44.00 10.0 undecidable manual S 356 0.018 2.52 0.2
--.PO9.Z. 1985-01-21T11:56:41.00 10.0 undecidable manual P 335 0.04 0.03 0.7
--.ORI.Z. 1985-01-21T11:56:36.00 10.0 undecidable manual S 26 0.015 0.17 0.3
--.GIB.Z. 1985-01-21T11:56:30.20 10.0 undecidable manual S 243 0.0113 0.31 0.5
--.SD1.Z. 1985-01-21T11:56:27.00 10.0 undecidable manual P 338 0.0305 -0.76 0.8
--.DUI.Z. 1985-01-21T11:56:25.50 10.0 undecidable manual P 346 0.0287 0.17 0.8
--.SGG.Z. 1985-01-21T11:56:22.00 10.0 undecidable manual P 343 0.0265 -0.4 1.7
--.MSC.Z. 1985-01-21T11:56:20.70 10.0 positive manual P 336 0.0258 -0.85 1.7
--.LCI.Z. 1985-01-21T11:56:19.20 10.0 positive manual P 48 0.0243 -0.42 1.8
--.PE1.Z. 1985-01-21T11:56:19.00 10.0 undecidable manual P 33 0.0243 -0.59 0.9
--.BAI.Z. 1985-01-21T11:56:19.00 10.0 undecidable manual P 22 0.0249 -1.31 0.8
--.TR9.Z. 1985-01-21T11:56:17.60 10.0 positive manual P 355 0.0223 0.41 1.8
--.BS1.Z. 1985-01-21T11:56:15.00 10.0 undecidable manual P 347 0.0204 0.22 0.9
--.SOR.Z. 1985-01-21T11:56:13.30 10.0 positive manual P 337 0.0198 -0.74 1.8
--.SGO.Z. 1985-01-21T11:56:12.00 10.0 positive manual P 356 0.018 0.01 1.8
--.FA1.Z. 1985-01-21T11:56:12.00 10.0 undecidable manual P 228 0.0172 0.87 0.9
--.ORI.Z. 1985-01-21T11:56:09.50 10.0 undecidable manual P 26 0.015 0.77 0.8
--.PA1.Z. 1985-01-21T11:56:08.20 10.0 negative manual P 196 0.0142 0.16 1.8
--.CSI.Z. 1985-01-21T11:56:07.00 10.0 undecidable manual P 27 0.0124 0.8 0.8
--.ROI.Z. 1985-01-21T11:56:06.80 10.0 undecidable manual P 39 0.0118 1.06 1.6
--.GIB.Z. 1985-01-21T11:56:04.80 10.0 negative manual P 243 0.0113 -0.5 1.8
--.MT1.Z. 1985-01-21T11:56:01.50 10.0 undecidable manual P 161 0.0051 0.41 1.8
--.QR9.Z. 1985-01-21T11:56:01.00 10.0 undecidable manual P 336 0.0227 -16.64 0
--.MSI.Z. 1985-01-21T11:56:00.00 10.0 undecidable manual P 169 0.0032 -0.39 0.9
--.ML1.Z. 1985-01-21T11:56:00.00 10.0 undecidable manual P 175 0.0039 -0.59 1.8
--.GZ1.Z. 1985-01-21T11:55:59.90 10.0 undecidable manual P 157 0.0028 -0.39 1.8
--.MES.Z. 1985-01-21T11:55:59.90 10.0 undecidable manual P 169 0.0032 -0.5 0.9
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
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Type Description Link
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