Earthquake with magnitude of M 2.0 on date 23-10-1985 and time 18:35:35 (Italy) in region Costa Ligure Occidentale (Imperia)

A magnitude M 2.0 earthquake occured in region: Costa Ligure Occidentale (Imperia), on

  • 23-10-1985 17:35:35 (UTC)
  • 23-10-1985 18:35:35 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.77, 7.86 at 17 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
Riva Ligure IM 8 2910 2910
Santo Stefano al Mare IM 8 2197 5107
Taggia IM 9 14116 19223
Sanremo IM 9 54807 74030
Pompeiana IM 10 823 74853
Terzorio IM 10 216 75069
Castellaro IM 11 1256 76325
Cipressa IM 11 1290 77615
Costarainera IM 12 828 78443
Ospedaletti IM 12 3367 81810
San Lorenzo al Mare IM 13 1297 83107
Pietrabruna IM 14 501 83608
Civezza IM 14 609 84217
Ceriana IM 15 1250 85467
Seborga IM 15 315 85782
Bordighera IM 16 10469 96251
Vallebona IM 17 1310 97561
Badalucco IM 17 1136 98697
Dolcedo IM 17 1415 100112
Vallecrosia IM 18 6956 107068
Soldano IM 18 977 108045
Montalto Ligure IM 18 377 108422
San Biagio della Cima IM 18 1329 109751
Imperia IM 19 42034 151785
PrelĂ  IM 19 503 152288
Perinaldo IM 19 870 153158
Bajardo IM 19 312 153470
Camporosso IM 20 5632 159102
Vasia IM 20 389 159491

Municipalities with at least 50000 inhabitants

An earthquake occurred to
9 Km SE of Sanremo (54807 inhabitants)
74 Km SE of Cuneo (56081 inhabitants)
78 Km SW of Savona (61345 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 M 2.0 1985-10-23
17:35:35
43.77 7.87 17 2013-07-15
08:40:51
Bollettino Sismico Italiano INGV 14989
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1985-10-23 17:35:35 ± 0.848
Latitude 43.77 ± 0.04
Longitude 7.87 ± 0.07
Depth (km) 17 ± 5 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 14989

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) 7100.7
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 331
Number of associated phases, regardless of their use for origin computation 6
Number of defining phases 6
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) 0.0013
Epicentral distance of station farthest from the epicenter (degree) 0.00478
Number of stations at which the event was observed 3
Number of stations from which data was used for origin computation 3
Magnitude information

M:2

Field Value
Value 2
Uncertainty
Num. used stations
Type of magnitude M
Reference to an origin 14989
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 Takeoff_angle Residual Weight
--.ROB.Z. 1985-10-23T17:35:54.30 10.0 undecidable manual SG 0 0.0048 0 0.8
--.FIN.Z. 1985-10-23T17:35:52.60 10.0 undecidable manual SG 29 0.0045 -0.77 0.3
--.ROB.Z. 1985-10-23T17:35:46.20 10.0 undecidable manual PG 0 0.0048 0.02 2.1
--.FIN.Z. 1985-10-23T17:35:46.20 10.0 undecidable manual PG 29 0.0045 0.55 1.2
--.IMP.Z. 1985-10-23T17:35:43.40 10.0 undecidable manual SG 7 0.0013 0.68 0.4
--.IMP.Z. 1985-10-23T17:35:38.90 10.0 undecidable manual PG 7 0.0013 -0.59 1.2
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
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