Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of Md 3.1 on date 15-07-1993 and time 01:29:31 (Italy) in region 4 km S Bormida (SV)

A magnitude Md 3.1 earthquake occured in region: 4 km S Bormida (SV), on

  • 14-07-1993 23:29:31 (UTC)
  • 15-07-1993 01:29:31 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.2480, 8.2280 at 9 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
Osiglia SV 4 444 831
Rialto SV 5 564 1395
Magliolo SV 6 974 2369
Calice Ligure SV 7 1730 4099
Mallare SV 8 1146 5245
Giustenice SV 8 977 6222
Orco Feglino SV 8 890 7112
Tovo San Giacomo SV 9 2582 9694
Calizzano SV 9 1475 11169
Murialdo SV 9 841 12010
Pallare SV 10 923 12933
Bardineto SV 10 756 13689
Vezzi Portio SV 11 809 14498
Borgio Verezzi SV 12 2205 16703
Pietra Ligure SV 12 8992 25695
Plodio SV 12 650 26345
Boissano SV 13 2492 28837
Finale Ligure SV 13 11711 40548
Roccavignale SV 13 752 41300
Millesimo SV 13 3383 44683
Carcare SV 13 5587 50270
Loano SV 13 11407 61677
Toirano SV 13 2644 64321
Altare SV 14 2108 66429
Cosseria SV 14 1105 67534
Massimino SV 14 113 67647
Castelnuovo di Ceva CN 14 110 67757
Balestrino SV 14 595 68352
Borghetto Santo Spirito SV 15 4948 73300
Perlo CN 15 116 73416
Spotorno SV 16 3803 77219
Erli SV 16 245 77464
Quiliano SV 16 7232 84696
Castelvecchio di Rocca Barbena SV 16 145 84841
Cengio SV 16 3563 88404
Noli SV 16 2736 91140
Bagnasco CN 16 1035 92175
Montezemolo CN 16 259 92434
Priola CN 16 701 93135
Garessio CN 17 3244 96379
Ceriale SV 17 5561 101940
Vado Ligure SV 17 8336 110276
Nucetto CN 17 430 110706
Bergeggi SV 17 1129 111835
Cairo Montenotte SV 17 13269 125104
Zuccarello SV 18 309 125413
Priero CN 18 529 125942
Cisano sul Neva SV 19 2085 128027
Battifollo CN 19 219 128246
Saliceto CN 19 1323 129569
Castelbianco SV 19 330 129899

Municipalities with at least 50000 inhabitants

An earthquake occurred to
21 Km W of Savona (61345 inhabitants)
56 Km E of Cuneo (56081 inhabitants)
59 Km W of Genova (586655 inhabitants)
59 Km NE of Sanremo (54807 inhabitants)
73 Km S of Asti (76202 inhabitants)
80 Km SW of Alessandria (93943 inhabitants)
94 Km SE of Moncalieri (57294 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 3.1
M 3.0 		1993-07-14
23:29:31		 44.248 8.228 9 2013-07-15
08:40:51		 Bollettino Sismico Italiano INGV 190889
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1993-07-14 23:29:31 ± 0.215
Latitude 44.2480 ± 0.0129
Longitude 8.2280 ± 0.0174
Depth (km) 9 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 190889

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) 1993.6
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 66
Number of associated phases, regardless of their use for origin computation 47
Number of defining phases 47
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) 0.00032
Epicentral distance of station farthest from the epicenter (degree) 0.03975
Number of stations at which the event was observed 26
Number of stations from which data was used for origin computation 26
Magnitudes information

Md:3.1

Field Value
Value 3.1
Uncertainty
Num. used stations 3
Type of magnitude Md
Reference to an origin 190889
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 19:59:16

M:3.0

Field Value
Value 3.0
Uncertainty
Num. used stations
Type of magnitude M
Reference to an origin 190889
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
--.BGF.Z. 1993-07-14T23:30:40.30 10.0 undecidable manual PN 303 4.4067 1.82 0.1
--.LPG.Z. 1993-07-14T23:30:22.90 10.0 undecidable manual SN 320 1.6317 1.94 0.1
--.LRG.Z. 1993-07-14T23:30:20.40 10.0 undecidable manual SN 240 1.554 1.02 0.3
--.LMR.Z. 1993-07-14T23:30:19.20 10.0 undecidable manual SN 234 1.5318 0.34 0.6
--.LSD.Z. 1993-07-14T23:30:16.30 10.0 undecidable manual SN 328 1.4208 0.12 0.7
--.BNI.Z. 1993-07-14T23:30:15.73 10.0 undecidable manual SN 306 1.3542 1.08 0.4
--.FRF.Z. 1993-07-14T23:30:14.20 10.0 undecidable manual SN 239 1.3209 0.34 0.6
--.ORO.Z. 1993-07-14T23:30:14.26 10.0 undecidable manual SN 352 1.3875 -1.02 0.3
--.RRL.Z. 1993-07-14T23:30:10.40 10.0 undecidable manual SN 303 1.221 -1.02 0.3
--.RSP.Z. 1993-07-14T23:30:07.80 10.0 undecidable manual SN 322 1.1322 -1.45 0.1
--.BOB.Z. 1993-07-14T23:30:05.49 10.0 undecidable manual SG 58 1.0101 -0.63 0.6
--.BDI.Z. 1993-07-14T23:30:02.21 10.0 undecidable manual PN 95 1.7094 1.02 0.7
--.LPG.Z. 1993-07-14T23:30:02.10 10.0 undecidable manual PN 320 1.6317 2.01 0.1
--.LPL.Z. 1993-07-14T23:30:02.20 10.0 undecidable manual PN 320 1.6428 1.8 0.2
--.BHB.Z. 1993-07-14T23:30:01.80 10.0 undecidable manual SG 310 0.8991 -0.79 0.4
--.PGF.Z. 1993-07-14T23:30:00.50 10.0 undecidable manual PN 161 1.776 -1.8 0.2
--.VAI.Z. 1993-07-14T23:30:00.40 10.0 undecidable manual PN 13 1.6539 -0.16 1.5
--.LRG.Z. 1993-07-14T23:29:59.50 10.0 undecidable manual PN 240 1.554 0.32 1.5
--.PZZ.Z. 1993-07-14T23:29:58.90 10.0 undecidable manual SG 288 0.8325 -1.83 0.1
--.LSD.Z. 1993-07-14T23:29:58.24 10.0 undecidable manual PN 328 1.4208 0.91 1.1
--.LMR.Z. 1993-07-14T23:29:58.80 10.0 undecidable manual PN 234 1.5318 -0.09 1.6
--.DOI.Z. 1993-07-14T23:29:57.61 10.0 undecidable manual SG 290 0.7437 0.02 0.8
--.BNI.Z. 1993-07-14T23:29:57.17 10.0 undecidable manual PN 306 1.3542 0.73 1.3
--.ORO.Z. 1993-07-14T23:29:56.90 10.0 undecidable manual PN 352 1.3875 0.09 1.7
--.FRF.Z. 1993-07-14T23:29:56.00 10.0 undecidable manual PN 239 1.3209 0.01 1.8
--.SBF.Z. 1993-07-14T23:29:55.40 10.0 undecidable manual SG 236 0.6882 -0.27 0.8
--.RRL.Z. 1993-07-14T23:29:54.98 10.0 undecidable manual PN 303 1.221 0.39 1.8
--.RSP.Z. 1993-07-14T23:29:53.34 10.0 undecidable manual PN 322 1.1322 0.02 1.9
--.STV.Z. 1993-07-14T23:29:53.30 10.0 undecidable manual SG 270 0.6327 -0.95 0.4
--.BOB.Z. 1993-07-14T23:29:51.38 10.0 undecidable manual PG 58 1.0101 -0.14 1.9
--.ENR.Z. 1993-07-14T23:29:51.20 10.0 undecidable manual SG 268 0.5772 -0.98 0.4
--.BHB.Z. 1993-07-14T23:29:49.44 10.0 undecidable manual PG 310 0.8991 -0.05 1.9
--.PZZ.Z. 1993-07-14T23:29:47.96 10.0 undecidable manual PG 288 0.8325 -0.45 1.6
--.DOI.Z. 1993-07-14T23:29:46.39 10.0 undecidable manual PG 290 0.7437 -0.2 1.8
--.IMI.Z. 1993-07-14T23:29:45.70 10.0 undecidable manual SG 215 0.4107 -1.22 0.4
--.SBF.Z. 1993-07-14T23:29:45.40 10.0 undecidable manual PG 236 0.6882 -0.09 2
--.PCP.Z. 1993-07-14T23:29:44.80 10.0 undecidable manual SG 37 0.3663 -0.7 0.5
--.STV.Z. 1993-07-14T23:29:44.98 10.0 undecidable manual PG 270 0.6327 0.3 1.9
--.ENR.Z. 1993-07-14T23:29:43.52 10.0 undecidable manual PG 268 0.5772 0.05 2
--.ROB.Z. 1993-07-14T23:29:41.10 10.0 undecidable manual SG 282 0.2553 -0.84 0.4
--.IMI.Z. 1993-07-14T23:29:40.60 10.0 undecidable manual PG 215 0.4107 -0.38 1.9
--.PCP.Z. 1993-07-14T23:29:39.30 10.0 undecidable manual PG 37 0.3663 -0.32 1.7
--.CKI.Z. 1993-07-14T23:29:38.60 10.0 undecidable manual SG 12 0.1665 -1.01 0.2
--.ROB.Z. 1993-07-14T23:29:37.66 10.0 undecidable manual PG 282 0.2553 0.09 2
--.CKI.Z. 1993-07-14T23:29:35.91 10.0 undecidable manual PG 12 0.1665 0 1.9
--.FIN.Z. 1993-07-14T23:29:34.90 10.0 undecidable manual SG 198 0.0333 -0.32 0.7
--.FIN.Z. 1993-07-14T23:29:34.40 10.0 undecidable manual PG 198 0.0333 0.36 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, /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