Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of Md 2.4 on date 18-09-1986 and time 13:24:30 (Italy) in region Costa Ligure centro orientale (Genova)

A magnitude Md 2.4 earthquake occured in region: Costa Ligure centro orientale (Genova), on

  • 18-09-1986 11:24:30 (UTC)
  • 18-09-1986 13:24:30 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.2650, 9.1460 at 5 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

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Portofino GE 7 420 420
Camogli GE 9 5378 5798
Santa Margherita Ligure GE 9 9338 15136
Recco GE 11 9752 24888
Rapallo GE 12 29796 54684
Sori GE 13 4205 58889
Zoagli GE 13 2472 61361
Pieve Ligure GE 13 2544 63905
Avegno GE 13 2525 66430
Bogliasco GE 14 4488 70918
Chiavari GE 15 27398 98316
Leivi GE 17 2442 100758
Uscio GE 17 2284 103042
Lavagna GE 17 12791 115833
Coreglia Ligure GE 17 285 116118
Tribogna GE 17 614 116732
Cicagna GE 18 2502 119234
Cogorno GE 18 5676 124910
San Colombano Certenoli GE 18 2683 127593
Moconesi GE 18 2614 130207
Carasco GE 19 3733 133940
Orero GE 19 565 134505
Sestri Levante GE 20 18578 153083
Lumarzo GE 20 1535 154618

Municipalities with at least 50000 inhabitants

An earthquake occurred to
24 Km SE of Genova (586655 inhabitants)
53 Km E of Savona (61345 inhabitants)
57 Km W of La Spezia (93959 inhabitants)
79 Km W of Carrara (63133 inhabitants)
83 Km W of Massa (69479 inhabitants)
84 Km SE of Alessandria (93943 inhabitants)
98 Km SW of Piacenza (102191 inhabitants)
99 Km W of Viareggio (62467 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 2.4
M 2.6 		1986-09-18
11:24:30		 44.265 9.146 5 2013-07-15
08:41:04		 Bollettino Sismico Italiano INGV 34289
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1986-09-18 11:24:30 ± 0.349
Latitude 44.2650 ± 0.0225
Longitude 9.1460 ± 0.0203
Depth (km) 5 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 34289

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) 2984.3
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 183
Number of associated phases, regardless of their use for origin computation 18
Number of defining phases 18
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) 0.00186
Epicentral distance of station farthest from the epicenter (degree) 0.01433
Number of stations at which the event was observed 10
Number of stations from which data was used for origin computation 10
Magnitudes information

Md:2.4

Field Value
Value 2.4
Uncertainty
Num. used stations 2
Type of magnitude Md
Reference to an origin 34289
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:34:52

M:2.6

Field Value
Value 2.6
Uncertainty
Num. used stations
Type of magnitude M
Reference to an origin 34289
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
--.ORX.Z. 1986-09-18T11:25:20.50 10.0 undecidable manual SN 329 1.5873 0.61 0.3
--.ROB.Z. 1986-09-18T11:25:02.80 10.0 undecidable manual SG 272 0.9102 0.57 0.5
--.IMP.Z. 1986-09-18T11:25:01.80 10.0 undecidable manual SG 249 0.9657 -2.11 0
--.ORX.Z. 1986-09-18T11:25:00.50 10.0 undecidable manual PN 329 1.5873 1.64 0.1
--.SOO.Z. 1986-09-18T11:24:58.60 10.0 undecidable manual PN 279 1.4763 1.34 0.3
--.FIN.Z. 1986-09-18T11:24:55.20 10.0 undecidable manual SG 265 0.666 0.61 0.5
--.STV.Z. 1986-09-18T11:24:54.60 10.0 undecidable manual PN 269 1.2987 -0.19 1.3
--.CK1.Z. 1986-09-18T11:24:53.50 10.0 undecidable manual SG 284 0.6327 0.02 0.7
--.BVT.Z. 1986-09-18T11:24:50.80 10.0 undecidable manual SG 66 0.5217 1.05 0.3
--.IMP.Z. 1986-09-18T11:24:49.70 10.0 undecidable manual PG 249 0.9657 0.07 1.5
--.CO9.Z. 1986-09-18T11:24:49.50 10.0 undecidable manual SG 22 0.5439 -1.02 0.4
--.ROB.Z. 1986-09-18T11:24:48.90 10.0 undecidable manual PG 272 0.9102 0.24 1.5
--.FIN.Z. 1986-09-18T11:24:43.90 10.0 undecidable manual PG 265 0.666 -0.34 1.5
--.CK1.Z. 1986-09-18T11:24:42.50 10.0 undecidable manual PG 284 0.6327 -1.1 0.6
--.CO9.Z. 1986-09-18T11:24:41.50 10.0 negative manual PG 22 0.5439 -0.39 2.9
--.BVT.Z. 1986-09-18T11:24:41.30 10.0 undecidable manual PG 66 0.5217 -0.15 1.6
--.GEN.Z. 1986-09-18T11:24:38.80 10.0 undecidable manual SG 316 0.2109 0.28 0.9
--.GEN.Z. 1986-09-18T11:24:34.60 10.0 undecidable manual PG 316 0.2109 -0.36 3
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download