Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of Md 2.3 on date 26-03-1986 and time 15:54:23 (UTC) in region 1 km W Cairo Montenotte (SV)

A magnitude Md 2.3 earthquake occured in region: 1 km W Cairo Montenotte (SV), on

  • 26-03-1986 15:54:23 (UTC)
  • 26-03-1986 16:54:23 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 44.4000, 8.2640 at 7 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.

Hai sentito il terremoto? Clicca qui

Did you feel it? Fill in the questionnaire.

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 1 13269 13269
Cosseria SV 4 1105 14374
Cengio SV 5 3563 17937
Plodio SV 5 650 18587
Carcare SV 5 5587 24174
Millesimo SV 6 3383 27557
Dego SV 7 1985 29542
Roccavignale SV 7 752 30294
Saliceto CN 8 1323 31617
Pallare SV 8 923 32540
Altare SV 10 2108 34648
Montezemolo CN 10 259 34907
Camerana CN 10 631 35538
Piana Crixia SV 10 788 36326
Gottasecca CN 10 148 36474
Castelnuovo di Ceva CN 12 110 36584
Giusvalla SV 12 441 37025
Castelletto Uzzone CN 12 331 37356
Murialdo SV 12 841 38197
Mallare SV 12 1146 39343
Merana AL 14 189 39532
Bormida SV 14 387 39919
Monesiglio CN 14 645 40564
Prunetto CN 14 451 41015
Priero CN 14 529 41544
Osiglia SV 14 444 41988
Sale delle Langhe CN 14 486 42474
Pontinvrea SV 15 847 43321
Sale San Giovanni CN 15 183 43504
Mioglia SV 16 526 44030
Paroldo CN 16 211 44241
Perlo CN 16 116 44357
Gorzegno CN 16 304 44661
Mombarcaro CN 16 268 44929
Pareto AL 16 554 45483
Pezzolo Valle Uzzone CN 17 344 45827
Quiliano SV 17 7232 53059
Spigno Monferrato AL 17 1050 54109
Serole AT 17 123 54232
Nucetto CN 18 430 54662
Levice CN 18 231 54893
Bergolo CN 18 71 54964
Ceva CN 18 5782 60746
Stella SV 18 3009 63755
Torresina CN 19 52 63807
Massimino SV 19 113 63920
San Benedetto Belbo CN 19 179 64099
Roascio CN 19 97 64196
Niella Belbo CN 19 372 64568
Mombaldone AT 20 209 64777
Rialto SV 20 564 65341
Vado Ligure SV 20 8336 73677

Municipalities with at least 50000 inhabitants

An earthquake occurred to
20 Km NW of Savona (61345 inhabitants)
53 Km W of Genova (586655 inhabitants)
56 Km S of Asti (76202 inhabitants)
57 Km E of Cuneo (56081 inhabitants)
64 Km SW of Alessandria (93943 inhabitants)
75 Km NE of Sanremo (54807 inhabitants)
81 Km SE of Moncalieri (57294 inhabitants)
88 Km SE of Torino (890529 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 2.3
M 2.6 		1986-03-26
15:54:23		 44.4 8.264 7 2013-07-15
08:40:51		 Bollettino Sismico Italiano INGV 24939
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1986-03-26 15:54:23 ± 0.258
Latitude 44.4000 ± 0.0117
Longitude 8.2640 ± 0.0172
Depth (km) 7 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 24939

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) 1890.7
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 164
Number of associated phases, regardless of their use for origin computation 12
Number of defining phases 12
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) 0.00016
Epicentral distance of station farthest from the epicenter (degree) 0.00745
Number of stations at which the event was observed 6
Number of stations from which data was used for origin computation 6
Magnitudes information

Md:2.3

Field Value
Value 2.3
Uncertainty
Num. used stations 1
Type of magnitude Md
Reference to an origin 24939
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:26:47

M:2.6

Field Value
Value 2.6
Uncertainty
Num. used stations
Type of magnitude M
Reference to an origin 24939
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
--.SOO.Z. 1986-03-26T15:54:52.70 10.0 undecidable manual SG 277 0.8214 -0.22 0.3
--.STV.Z. 1986-03-26T15:54:47.40 10.0 undecidable manual SG 257 0.6882 -0.65 0.1
--.IMP.Z. 1986-03-26T15:54:43.50 10.0 undecidable manual SG 209 0.5439 -0.27 0.4
--.SOO.Z. 1986-03-26T15:54:41.00 10.0 undecidable manual PG 277 0.8214 0.46 0.5
--.STV.Z. 1986-03-26T15:54:38.60 10.0 positive manual PG 257 0.6882 0.88 0.1
--.IMP.Z. 1986-03-26T15:54:35.00 10.0 undecidable manual PG 209 0.5439 -0.25 1
--.ROB.Z. 1986-03-26T15:54:35.20 10.0 undecidable manual SG 250 0.2886 -0.09 0.8
--.FIN.Z. 1986-03-26T15:54:32.10 10.0 undecidable manual SG 191 0.1887 0.56 0.3
--.ROB.Z. 1986-03-26T15:54:30.40 10.0 undecidable manual PG 250 0.2886 0.05 2.8
--.FIN.Z. 1986-03-26T15:54:28.00 10.0 positive manual PG 191 0.1887 -0.19 2.5
--.CKI.Z. 1986-03-26T15:54:25.80 10.0 undecidable manual SG 27 0.0222 -0.43 0.5
--.CKI.Z. 1986-03-26T15:54:25.00 10.0 positive manual PG 27 0.0222 -0.13 2.7
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