Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of Md 2.3 on date 27-12-1989 and time 12:28:47 (Italy) in region Costa Ligure Occidentale (Imperia)

A magnitude Md 2.3 earthquake occured in region: Costa Ligure Occidentale (Imperia), on

  • 27-12-1989 11:28:47 (UTC)
  • 27-12-1989 12:28:47 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.6100, 7.4730 at 10 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
35 Km SW of Sanremo (54807 inhabitants)
87 Km S of Cuneo (56081 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 2.3
M 2.8 		1989-12-27
11:28:47		 43.61 7.473 10 2013-07-15
08:40:51		 Bollettino Sismico Italiano INGV 106749
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1989-12-27 11:28:47 ± 0.377
Latitude 43.6100 ± 0.0205
Longitude 7.4730 ± 0.0239
Depth (km) 10 ± 5 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 106749

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) 2986.3
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 203
Number of associated phases, regardless of their use for origin computation 28
Number of defining phases 28
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.5
Epicentral distance of station closest to the epicenter (degree) 0.00227
Epicentral distance of station farthest from the epicenter (degree) 0.01773
Number of stations at which the event was observed 17
Number of stations from which data was used for origin computation 17
Magnitudes information

Md:2.3

Field Value
Value 2.3
Uncertainty
Num. used stations 2
Type of magnitude Md
Reference to an origin 106749
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 18:39:24

M:2.8

Field Value
Value 2.8
Uncertainty
Num. used stations
Type of magnitude M
Reference to an origin 106749
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2015-04-28 09:48:29
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
--.LPL.Z. 1989-12-27T11:29:22.40 10.0 undecidable manual PN 344 1.9647 1.43 0.3
--.CKI.Z. 1989-12-27T11:29:21.60 10.0 undecidable manual SG 35 0.9879 -0.58 0.4
--.LSD.Z. 1989-12-27T11:29:20.45 10.0 undecidable manual PN 353 1.8537 1.09 0.5
--.PZZ.Z. 1989-12-27T11:29:19.62 10.0 undecidable manual SG 343 0.9213 -0.04 0.6
--.DOI.Z. 1989-12-27T11:29:18.96 10.0 undecidable manual SG 349 0.8991 0.14 0.6
--.LRG.Z. 1989-12-27T11:29:15.30 10.0 undecidable manual SG 259 0.8214 -0.75 0.3
--.FIN.Z. 1989-12-27T11:29:14.19 10.0 undecidable manual SG 41 0.7881 -1.15 0.2
--.RSP.Z. 1989-12-27T11:29:14.60 10.0 undecidable manual PN 354 1.5429 -0.48 0.8
--.RRL.Z. 1989-12-27T11:29:14.81 10.0 undecidable manual PN 339 1.3875 1.77 0.2
--.LMR.Z. 1989-12-27T11:29:12.00 10.0 undecidable manual SG 248 0.7437 -1.81 0
--.ROB.Z. 1989-12-27T11:29:12.45 10.0 undecidable manual SG 22 0.7437 -1.31 0.2
--.ENR.Z. 1989-12-27T11:29:09.17 10.0 undecidable manual SG 356 0.6105 -0.34 0.9
--.STV.Z. 1989-12-27T11:29:09.88 10.0 undecidable manual SG 350 0.6438 -0.67 0.7
--.PCP.Z. 1989-12-27T11:29:09.93 10.0 undecidable manual PN 39 1.1988 -0.48 0.8
--.FRF.Z. 1989-12-27T11:29:08.00 10.0 undecidable manual SG 265 0.5883 -0.97 0.2
--.CKI.Z. 1989-12-27T11:29:06.38 10.0 undecidable manual PG 35 0.9879 -0.96 0.5
--.PZZ.Z. 1989-12-27T11:29:06.39 10.0 undecidable manual PG 343 0.9213 0.2 1.5
--.DOI.Z. 1989-12-27T11:29:06.20 10.0 undecidable manual PG 349 0.8991 0.31 1.5
--.FIN.Z. 1989-12-27T11:29:03.80 10.0 positive manual PG 41 0.7881 -0.62 1.6
--.LRG.Z. 1989-12-27T11:29:03.60 10.0 undecidable manual PG 259 0.8214 -0.51 0.9
--.ROB.Z. 1989-12-27T11:29:02.80 10.0 positive manual PG 22 0.7437 0.02 2.9
--.IMI.Z. 1989-12-27T11:29:02.70 10.0 undecidable manual SG! 45 0.4218 -0.71 0
--.STV.Z. 1989-12-27T11:29:01.11 10.0 negative manual PG 350 0.6438 0.18 3
--.LMR.Z. 1989-12-27T11:29:01.90 10.0 undecidable manual PG 248 0.7437 -0.92 0.4
--.ENR.Z. 1989-12-27T11:29:00.68 10.0 negative manual PG 356 0.6105 0.34 2.9
--.FRF.Z. 1989-12-27T11:28:59.70 10.0 undecidable manual PG 265 0.5883 -0.32 1.1
--.IMI.Z. 1989-12-27T11:28:56.90 10.0 positive manual PG 45 0.4218 0.09 2.9
--.SBF.Z. 1989-12-27T11:28:54.50 10.0 undecidable manual PG 353 0.2553 0.89 1
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
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Type Description Link
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QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download