Earthquake with magnitude of Md 2.0 on date 18-04-1985 and time 14:58:41 (UTC) in region 2 km SW Cairo Montenotte (SV)

A magnitude Md 2.0 earthquake occured in region: 2 km SW Cairo Montenotte (SV), on

  • 18-04-1985 14:58:41 (UTC)
  • 18-04-1985 16:58:41 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.3850, 8.2680 at 6 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
Cairo Montenotte SV 2 13269 13269
Cosseria SV 3 1105 14374
Carcare SV 4 5587 19961
Plodio SV 4 650 20611
Cengio SV 5 3563 24174
Millesimo SV 5 3383 27557
Pallare SV 6 923 28480
Roccavignale SV 6 752 29232
Dego SV 8 1985 31217
Altare SV 8 2108 33325
Saliceto CN 9 1323 34648
Montezemolo CN 10 259 34907
Mallare SV 11 1146 36053
Camerana CN 11 631 36684
Murialdo SV 11 841 37525
Castelnuovo di Ceva CN 11 110 37635
Gottasecca CN 12 148 37783
Piana Crixia SV 12 788 38571
Bormida SV 12 387 38958
Giusvalla SV 12 441 39399
Osiglia SV 13 444 39843
Castelletto Uzzone CN 14 331 40174
Priero CN 14 529 40703
Sale delle Langhe CN 15 486 41189
Pontinvrea SV 15 847 42036
Monesiglio CN 15 645 42681
Sale San Giovanni CN 15 183 42864
Merana AL 15 189 43053
Prunetto CN 15 451 43504
Quiliano SV 15 7232 50736
Perlo CN 16 116 50852
Paroldo CN 16 211 51063
Mioglia SV 16 526 51589
Mombarcaro CN 17 268 51857
Pareto AL 17 554 52411
Nucetto CN 17 430 52841
Gorzegno CN 18 304 53145
Stella SV 18 3009 56154
Massimino SV 18 113 56267
Pezzolo Valle Uzzone CN 18 344 56611
Rialto SV 18 564 57175
Ceva CN 18 5782 62957
Spigno Monferrato AL 19 1050 64007
Vado Ligure SV 19 8336 72343
Vezzi Portio SV 19 809 73152
Serole AT 19 123 73275
Orco Feglino SV 19 890 74165
Savona SV 19 61345 135510
Torresina CN 19 52 135562
Levice CN 19 231 135793
Bergolo CN 19 71 135864
Albissola Marina SV 20 5487 141351
Roascio CN 20 97 141448
Calice Ligure SV 20 1730 143178

Municipalities with at least 50000 inhabitants

An earthquake occurred to
19 Km W of Savona (61345 inhabitants)
53 Km W of Genova (586655 inhabitants)
57 Km E of Cuneo (56081 inhabitants)
58 Km S of Asti (76202 inhabitants)
65 Km SW of Alessandria (93943 inhabitants)
74 Km NE of Sanremo (54807 inhabitants)
83 Km SE of Moncalieri (57294 inhabitants)
90 Km SE of Torino (890529 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
Md 2.0 1985-04-18
14:58:41
44.385 8.268 6 2013-07-15
08:40:51
Bollettino Sismico Italiano INGV 4899
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1985-04-18 14:58:41 ± 0.402
Latitude 44.3850 ± 0.0108
Longitude 8.2680 ± 0.0204
Depth (km) 6 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 4899

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) 2015.1
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 181
Number of associated phases, regardless of their use for origin computation 8
Number of defining phases 8
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.2
Epicentral distance of station closest to the epicenter (degree) 0.00024
Epicentral distance of station farthest from the epicenter (degree) 0.00615
Number of stations at which the event was observed 4
Number of stations from which data was used for origin computation 4
Magnitude information

Md:2.0

Field Value
Value 2.0
Uncertainty
Num. used stations 1
Type of magnitude Md
Reference to an origin 4899
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:09:26
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.STV.Z. 1985-04-18T14:59:05.70 10.0 undecidable manual SG 259 0.0062 -0.85 0
--.STV.Z. 1985-04-18T14:58:56.80 10.0 undecidable manual PG 259 0.0062 0.63 0.3
--.ROB.Z. 1985-04-18T14:58:53.60 10.0 undecidable manual SG 253 0.0026 0.07 0.8
--.FIN.Z. 1985-04-18T14:58:49.50 10.0 undecidable manual SG 193 0.0016 0.17 0.7
--.ROB.Z. 1985-04-18T14:58:48.50 10.0 undecidable manual PG 253 0.0026 -0.16 1.8
--.FIN.Z. 1985-04-18T14:58:46.10 10.0 undecidable manual PG 193 0.0016 -0.13 1.8
--.CK1.Z. 1985-04-18T14:58:44.50 10.0 undecidable manual SG 12 0.0002 -0.09 0.7
--.CK1.Z. 1985-04-18T14:58:43.50 10.0 undecidable manual PG 12 0.0002 0.01 1.9
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