Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of M 2.3 on date 22-08-1993 and time 20:54:44 (UTC) in region 4 km S Bormida (SV)

A magnitude M 2.3 earthquake occured in region: 4 km S Bormida (SV), on

  • 22-08-1993 20:54:44 (UTC)
  • 22-08-1993 22:54:44 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.2480, 8.2370 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.

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Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Bormida SV 4 387 387
Rialto SV 4 564 951
Osiglia SV 5 444 1395
Magliolo SV 6 974 2369
Calice Ligure SV 7 1730 4099
Mallare SV 7 1146 5245
Orco Feglino SV 8 890 6135
Tovo San Giacomo SV 8 2582 8717
Giustenice SV 8 977 9694
Pallare SV 10 923 10617
Calizzano SV 10 1475 12092
Murialdo SV 10 841 12933
Vezzi Portio SV 10 809 13742
Bardineto SV 11 756 14498
Borgio Verezzi SV 11 2205 16703
Pietra Ligure SV 12 8992 25695
Plodio SV 12 650 26345
Finale Ligure SV 12 11711 38056
Boissano SV 13 2492 40548
Altare SV 13 2108 42656
Carcare SV 13 5587 48243
Roccavignale SV 13 752 48995
Loano SV 13 11407 60402
Millesimo SV 13 3383 63785
Cosseria SV 14 1105 64890
Toirano SV 14 2644 67534
Massimino SV 14 113 67647
Balestrino SV 14 595 68242
Castelnuovo di Ceva CN 15 110 68352
Borghetto Santo Spirito SV 15 4948 73300
Spotorno SV 15 3803 77103
Quiliano SV 15 7232 84335
Noli SV 15 2736 87071
Perlo CN 15 116 87187
Cengio SV 16 3563 90750
Vado Ligure SV 16 8336 99086
Castelvecchio di Rocca Barbena SV 16 145 99231
Erli SV 16 245 99476
Montezemolo CN 16 259 99735
Bergeggi SV 17 1129 100864
Bagnasco CN 17 1035 101899
Ceriale SV 17 5561 107460
Priola CN 17 701 108161
Cairo Montenotte SV 17 13269 121430
Garessio CN 17 3244 124674
Nucetto CN 17 430 125104
Zuccarello SV 18 309 125413
Priero CN 18 529 125942
Cisano sul Neva SV 19 2085 128027
Saliceto CN 19 1323 129350
Battifollo CN 20 219 129569
Castelbianco SV 20 330 129899

Municipalities with at least 50000 inhabitants

An earthquake occurred to
21 Km W of Savona (61345 inhabitants)
57 Km E of Cuneo (56081 inhabitants)
58 Km W of Genova (586655 inhabitants)
60 Km NE of Sanremo (54807 inhabitants)
73 Km S of Asti (76202 inhabitants)
80 Km SW of Alessandria (93943 inhabitants)
95 Km SE of Moncalieri (57294 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 		M 2.3 1993-08-22
20:54:44		 44.248 8.237 10 2013-07-15
08:40:51		 Bollettino Sismico Italiano INGV 194939
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1993-08-22 20:54:44 ± 0.261
Latitude 44.2480 ± 0.0167
Longitude 8.2370 ± 0.0211
Depth (km) 10 ± 3 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 194939

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) 2503.9
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 170
Number of associated phases, regardless of their use for origin computation 14
Number of defining phases 14
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.3
Epicentral distance of station closest to the epicenter (degree) 0.00032
Epicentral distance of station farthest from the epicenter (degree) 0.00809
Number of stations at which the event was observed 8
Number of stations from which data was used for origin computation 8
Magnitude information

M:2.3

Field Value
Value 2.3
Uncertainty
Num. used stations
Type of magnitude M
Reference to an origin 194939
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
--.STV.Z. 1993-08-22T20:55:06.68 10.0 undecidable manual SG 270 0.6438 -0.71 0.2
--.ENR.Z. 1993-08-22T20:55:04.53 10.0 undecidable manual SG 268 0.5883 -0.8 0.1
--.BHB.Z. 1993-08-22T20:55:02.70 10.0 undecidable manual PG 310 0.8991 0.13 1.4
--.PZZ.Z. 1993-08-22T20:55:01.56 10.0 undecidable manual PG 287 0.8436 0.04 1.5
--.IMI.Z. 1993-08-22T20:54:59.40 10.0 undecidable manual SG 216 0.4107 -0.58 0.4
--.STV.Z. 1993-08-22T20:54:58.70 10.0 undecidable manual PG 270 0.6438 0.29 1.4
--.ENR.Z. 1993-08-22T20:54:57.20 10.0 undecidable manual PG 268 0.5883 0.44 1.1
--.PCP.Z. 1993-08-22T20:54:57.25 10.0 undecidable manual SG 36 0.3552 -1.08 0
--.ROB.Z. 1993-08-22T20:54:54.32 10.0 undecidable manual SG 281 0.2553 -0.77 0.2
--.IMI.Z. 1993-08-22T20:54:53.18 10.0 undecidable manual PG 216 0.4107 -0.32 1.6
--.PCP.Z. 1993-08-22T20:54:52.35 10.0 undecidable manual PG 36 0.3552 -0.2 1.9
--.ROB.Z. 1993-08-22T20:54:51.30 10.0 undecidable manual PG 281 0.2553 0.35 1.5
--.FIN.Z. 1993-08-22T20:54:48.19 10.0 undecidable manual SG 206 0.0333 -0.44 0.5
--.FIN.Z. 1993-08-22T20:54:47.90 10.0 undecidable manual PG 206 0.0333 0.15 2
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