Earthquake with magnitude of M 3.3 on date 21-02-1985 and time 19:00:34 (Italy) in region 1 km W Vignolo (CN)

A magnitude M 3.3 earthquake occured in region: 1 km W Vignolo (CN), on

  • 21-02-1985 18:00:34 (UTC)
  • 21-02-1985 19:00:34 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 44.3560, 7.4600 at 4 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
Vignolo CN 1 2600 2600
Roccasparvera CN 2 741 3341
Cervasca CN 3 5013 8354
Borgo San Dalmazzo CN 4 12468 20822
Bernezzo CN 4 4104 24926
Gaiola CN 5 582 25508
Rittana CN 5 109 25617
Roccavione CN 5 2761 28378
Moiola CN 7 234 28612
Valloriate CN 7 109 28721
Caraglio CN 7 6836 35557
Boves CN 8 9835 45392
Robilante CN 8 2306 47698
Cuneo CN 9 56081 103779
Valgrana CN 9 786 104565
Roaschia CN 9 107 104672
Valdieri CN 10 935 105607
Montemale di Cuneo CN 12 241 105848
Monterosso Grana CN 12 505 106353
Peveragno CN 13 5543 111896
Vernante CN 14 1178 113074
Demonte CN 14 2003 115077
Entracque CN 14 774 115851
Dronero CN 15 7035 122886
Beinette CN 15 3423 126309
Villar San Costanzo CN 16 1547 127856
Pradleves CN 16 250 128106
Roccabruna CN 16 1585 129691
Tarantasca CN 17 2122 131813
Castelletto Stura CN 17 1351 133164
Chiusa di Pesio CN 18 3676 136840
Busca CN 18 10181 147021
Margarita CN 19 1441 148462
Cartignano CN 19 190 148652
Limone Piemonte CN 20 1485 150137
Aisone CN 20 248 150385
Centallo CN 20 6954 157339

Municipalities with at least 50000 inhabitants

An earthquake occurred to
9 Km SW of Cuneo (56081 inhabitants)
65 Km NW of Sanremo (54807 inhabitants)
74 Km S of Moncalieri (57294 inhabitants)
82 Km W of Savona (61345 inhabitants)
82 Km S of Torino (890529 inhabitants)
85 Km SW of Asti (76202 inhabitants)
Recent and historical seismicity

These maps show the seismic activity in different time intervals, before the seismic event to which they refer. Data reported in the first two maps come from the analysis carried out in real time by the personnel of the INGV Operating Rooms, immediately after each earthquake. The third map shows data from 1985 to the date of the earthquake: the locations are reviewed by the seismological analysts of the INGV Italian Seismic Bulletin (Bollettino Sismico Italiano dell’INGV). The localization parameters (hypocentral coordinates and magnitude) are the best possible estimate with the data available to the INGV, but are constantly updated according to further data that become available. The location and magnitude parameters, subsequently reviewed by seismological analysts, may vary.

Earthquakes of the 3 days preceding this event

Earthquakes of the 3 days preceding this event

This map shows the earthquake epicenters with magnitude ≥ 0.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, in the 72 hours preceding this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.
Earthquakes of the 90 days preceding this event

Earthquakes of the 90 days preceding this event

This map shows the earthquake epicenters with magnitude ≥ 2.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, in the 90 days preceding this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.
Earthquakes from 1985 to the date of the event

Earthquakes from 1985 to the date of the event

This map shows the earthquake epicenters with magnitude ≥ 3.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, from 1985 to the date of this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.
Earthquakes since 1000 AD until 2019

Earthquakes since 1000 AD until 2019

This map shows the epicenters of the historical earthquakes catalogue CPT15 (Catalogo Parametrico dei Terremoti Italiani, 2015 version 3.0, https://doi.org/10.13127/cpti/cpti15.3) since 1000 AD until 2019. The size of the square indicates the different classes of magnitude. For earthquakes with magnitude ≥ 6.0, it is also shown the year of occurrence and the magnitude value. The black and white star is the epicenter of the current earthquake.
Seismic hazard

Seismic hazard maps provide probabilistic estimates of the earthquake ground shaking exceeding a given threshold in a given geographic region within a given time window. Thus, it is not a deterministic prediction - a target that may be never reached given the complexity of the earthquake physical phenomenon - nor of the maximum expected earthquake since this has extremely low probabilities to occur.

In 2004, it was published the seismic hazard map of Italy (http://zonesismiche.mi.ingv.it) that provides a picture of the most hazardous geographic regions. The seismic hazard map of Italy (GdL MPS, 2004; rif. Ordinanza PCM del 28 aprile 2006, n. 3519, All. 1b) provides the 10% probability of exceedance in 50 years of the horizontal acceleration at rock sites (i.e., Vs30>800 m/s; cat. A, 3.2.1 of the D.M. 14.09.2005).

The colours indicate the various values of the ground acceleration that have 10% to be exceeded within 50 years. In general, the colours associated to low values of acceleration refer to areas that are less hazardous and stronger earthquakes repeat less frequently although they may still occur.

Seismic hazard map

Seismic hazard map

This map shows the seismic hazard map of Italy for the region where the earthquake occurred.
Shakemap
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Bulletin
Rev1000
M 3.3 1985-02-21
18:00:34
44.356 7.46 4 2013-07-15
08:40:51
Bollettino Sismico Italiano INGV 2169
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1985-02-21 18:00:34 ± 0.471
Latitude 44.3560 ± 0.0256
Longitude 7.4600 ± 0.0236
Depth (km) 4 ± 4 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 2169

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) 3415.1
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 58
Number of associated phases, regardless of their use for origin computation 36
Number of defining phases 36
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) 0.00113
Epicentral distance of station farthest from the epicenter (degree) 0.04112
Number of stations at which the event was observed 30
Number of stations from which data was used for origin computation 30
Magnitude information

M:3.3

Field Value
Value 3.3
Uncertainty
Num. used stations
Type of magnitude M
Reference to an origin 2169
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2015-04-28 09:50:03
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.LSF.Z. 1985-02-21T18:01:45.10 10.0 undecidable manual PN 296 0.0411 1.07 0.6
--.TCF.Z. 1985-02-21T18:01:39.40 10.0 undecidable manual PN 299 0.0374 1.05 0.6
--.BGF.Z. 1985-02-21T18:01:35.50 10.0 undecidable manual PN 305 0.0351 0.61 0.8
--.CAF.Z. 1985-02-21T18:01:35.00 10.0 undecidable manual PN 280 0.0349 0.57 0.8
--.LOR.Z. 1985-02-21T18:01:34.90 10.0 undecidable manual PN 320 0.0346 0.96 0.7
--.AVF.Z. 1985-02-21T18:01:33.30 10.0 undecidable manual PN 311 0.0338 0.43 0.9
--.LBF.Z. 1985-02-21T18:01:31.40 10.0 undecidable manual PN 318 0.0322 1.07 0.7
--.HAU.Z. 1985-02-21T18:01:31.80 10.0 undecidable manual PN 348 0.0335 -0.56 0.8
--.SMF.Z. 1985-02-21T18:01:28.60 10.0 undecidable manual PN 313 0.0307 0.54 0.9
--.BVT.Z. 1985-02-21T18:01:25.30 10.0 undecidable manual SN 85 0.0151 -1.09 0.4
--.VEA.Z. 1985-02-21T18:01:24.00 10.0 undecidable manual SN 70 0.0146 -0.95 0.4
--.OSS.Z. 1985-02-21T18:01:23.80 10.0 undecidable manual PN 37 0.0269 1.53 0.5
--.STG.Z. 1985-02-21T18:01:13.80 10.0 undecidable manual PN 339 0.0210 0.55 1.1
--.GEN.Z. 1985-02-21T18:01:10.00 10.0 undecidable manual SG 86 0.0095 -1.21 0.3
--.CVF.Z. 1985-02-21T18:01:08.70 10.0 undecidable manual PN 149 0.0185 -0.77 1.1
--.VEA.Z. 1985-02-21T18:01:07.60 10.0 undecidable manual PN 70 0.0146 4.1 0
--.EMS.Z. 1985-02-21T18:01:06.40 10.0 undecidable manual PN 347 0.0157 1.15 0.9
--.BVT.Z. 1985-02-21T18:01:05.30 10.0 undecidable manual PN 85 0.0151 0.97 1
--.MMK.Z. 1985-02-21T18:01:04.80 10.0 undecidable manual PN 11 0.0155 -0.16 1.4
--.DIX.Z. 1985-02-21T18:01:04.60 10.0 undecidable manual PN 358 0.0155 -0.25 1.4
--.ORO.Z. 1985-02-21T18:00:57.00 10.0 undecidable manual PN 15 0.0119 -2.35 0.2
--.CK1.Z. 1985-02-21T18:00:57.00 10.0 undecidable manual SG 83 0.0053 0.87 0.7
--.ORX.Z. 1985-02-21T18:00:57.00 10.0 undecidable manual PN 15 0.0119 -2.41 0.2
--.LMR.Z. 1985-02-21T18:00:57.40 10.0 undecidable manual PN 214 0.0110 -0.69 1.2
--.GAI.Z. 1985-02-21T18:00:56.00 10.0 undecidable manual SG 353 0.0062 -3.4 0
--.LRG.Z. 1985-02-21T18:00:56.90 10.0 undecidable manual PN 221 0.0108 -0.77 1.2
--.GEN.Z. 1985-02-21T18:00:55.10 10.0 undecidable manual PG 86 0.0095 -0.47 1.3
--.FIN.Z. 1985-02-21T18:00:54.60 10.0 undecidable manual SG 105 0.0049 -0.5 0.8
--.FRF.Z. 1985-02-21T18:00:53.10 10.0 undecidable manual PG 216 0.0088 -1.17 0.9
--.CK1.Z. 1985-02-21T18:00:48.00 10.0 undecidable manual PG 83 0.0053 1.14 0.9
--.FIN.Z. 1985-02-21T18:00:46.10 10.0 negative manual PG 105 0.0049 -0.16 2.8
--.GAI.Z. 1985-02-21T18:00:46.20 10.0 undecidable manual PG 353 0.0062 -2.55 0.2
--.IMP.Z. 1985-02-21T18:00:45.60 10.0 negative manual PG 144 0.0048 -0.34 2.7
--.ROB.Z. 1985-02-21T18:00:41.70 10.0 negative manual PG 100 0.0027 0.78 2.3
--.STV.Z. 1985-02-21T18:00:37.10 10.0 negative manual PG 221 0.0012 -0.32 2.7
--.ENR.Z. 1985-02-21T18:00:37.10 10.0 undecidable manual PG 192 0.0011 -0.16 2.8
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Fault Plane solutions

Fault Plane solutions

The map reports the fault plane solutions for earthquakes in the region from 1977 to the date of this event. Red moment tensors are determined using the Regional Centroid Moment Tensor technique (RCMT, http://www.bo.ingv.it/RCMT) applied for earthquakes with magnitude larger than 4.5 in the Euro-Mediterranenan area. Occasionally, when a station azimuthal coverage exists RCMTs can be obtained also for earthquakes with magnitude down to 4.0. The gray moment tensors are obtained with the Time Domain Moment Tensor method (TDMT, http://terremoti.ingv.it/tdmt). This technique is applied to earthquakes with magnitude ML greater than 3.2, when it is possible. The size of symbols scales with the calculated moment magnitude Mw.
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download