Earthquake with magnitude of Md 2.3 on date 01-09-1985 and time 22:30:06 (UTC) in region 1 km NW Cosio d'Arroscia (IM)

A magnitude Md 2.3 earthquake occured in region: 1 km NW Cosio d'Arroscia (IM), on

  • 01-09-1985 22:30:06 (UTC)
  • 02-09-1985 00:30:06 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.08, 7.82 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.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Cosio d'Arroscia IM 1 221 221
Mendatica IM 2 185 406
Montegrosso Pian Latte IM 2 118 524
Pornassio IM 4 685 1209
Briga Alta CN 6 39 1248
Armo IM 7 111 1359
Rezzo IM 8 366 1725
Pieve di Teco IM 8 1338 3063
Ormea CN 10 1617 4680
Molini di Triora IM 11 617 5297
Triora IM 11 355 5652
Caprauna CN 11 104 5756
Vessalico IM 12 282 6038
Borghetto d'Arroscia IM 13 456 6494
Aurigo IM 14 347 6841
Carpasio IM 14 168 7009
Aquila d'Arroscia IM 15 166 7175
Cesio IM 15 283 7458
Caravonica IM 15 282 7740
Alto CN 15 128 7868
Borgomaro IM 15 865 8733
Ranzo IM 16 557 9290
Nasino SV 17 207 9497
Lucinasco IM 17 272 9769
Montalto Ligure IM 17 377 10146
Chiusavecchia IM 18 577 10723
Chiusanico IM 18 607 11330
Onzo SV 18 219 11549
Badalucco IM 19 1136 12685
Testico SV 19 196 12881
Casanova Lerrone SV 19 749 13630
PrelĂ  IM 20 503 14133
Vasia IM 20 389 14522

Municipalities with at least 50000 inhabitants

An earthquake occurred to
29 Km N of Sanremo (54807 inhabitants)
41 Km SE of Cuneo (56081 inhabitants)
58 Km W of Savona (61345 inhabitants)
96 Km SW of Asti (76202 inhabitants)
96 Km W of Genova (586655 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 Md 2.3 1985-09-01
22:30:06
44.08 7.82 10 2013-07-15
08:40:51
Bollettino Sismico Italiano INGV 12629
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1985-09-01 22:30:06 ± 0.401
Latitude 44.08 ± 0.03
Longitude 7.82 ± 0.03
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 12629

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) 3505.5
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 15
Number of defining phases 15
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) 0.00194
Epicentral distance of station farthest from the epicenter (degree) 0.01522
Number of stations at which the event was observed 8
Number of stations from which data was used for origin computation 8
Magnitude information

Md:2.3

Field Value
Value 2.3
Uncertainty
Num. used stations 2
Type of magnitude Md
Reference to an origin 12629
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:15:51
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.CVF.Z. 1985-09-01T22:30:55.50 10.0 undecidable manual SN 152 0.0152 -2.05 0
--.LRG.Z. 1985-09-01T22:30:47.60 10.0 undecidable manual SN 239 0.011 1.15 0.2
--.LMR.Z. 1985-09-01T22:30:46.00 10.0 undecidable manual SN 232 0.0108 0.01 0.6
--.FRF.Z. 1985-09-01T22:30:41.00 10.0 undecidable manual SG 238 0.0089 0.29 0.6
--.CVF.Z. 1985-09-01T22:30:35.20 10.0 undecidable manual PN 152 0.0152 -0.9 0.5
--.LMR.Z. 1985-09-01T22:30:30.00 10.0 undecidable manual PN 232 0.0108 0.57 1.1
--.LRG.Z. 1985-09-01T22:30:30.80 10.0 undecidable manual PN 239 0.011 1.1 0.4
--.DA9.Z. 1985-09-01T22:30:27.00 10.0 undecidable manual SG 315 0.0053 -0.63 0.7
--.FRF.Z. 1985-09-01T22:30:26.30 10.0 undecidable manual PG 238 0.0089 -0.09 1.6
--.CKI.Z. 1985-09-01T22:30:24.00 10.0 undecidable manual SG 43 0.0042 0.23 0.6
--.STV.Z. 1985-09-01T22:30:20.10 10.0 undecidable manual SG 295 0.0035 -1.17 0.3
--.DA9.Z. 1985-09-01T22:30:19.50 10.0 undecidable manual PG 315 0.0053 0.67 1.1
--.CKI.Z. 1985-09-01T22:30:17.00 10.0 undecidable manual PG 43 0.0042 0.4 1.5
--.STV.Z. 1985-09-01T22:30:14.60 10.0 undecidable manual PG 295 0.0035 -0.55 2.5
--.ROB.Z. 1985-09-01T22:30:12.10 10.0 positive manual PG 9 0.0019 0.08 3.4
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
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