Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of Md 3.5 on date 17-07-1993 and time 09:54:44 (Italy) in region 4 km W Rialto (SV)

A magnitude Md 3.5 earthquake occured in region: 4 km W Rialto (SV), on

  • 17-07-1993 07:54:44 (UTC)
  • 17-07-1993 09:54:44 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.2370, 8.2360 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
Rialto SV 4 564 564
Bormida SV 5 387 951
Magliolo SV 5 974 1925
Osiglia SV 6 444 2369
Calice Ligure SV 6 1730 4099
Tovo San Giacomo SV 7 2582 6681
Giustenice SV 7 977 7658
Orco Feglino SV 7 890 8548
Mallare SV 8 1146 9694
Calizzano SV 10 1475 11169
Bardineto SV 10 756 11925
Borgio Verezzi SV 10 2205 14130
Vezzi Portio SV 10 809 14939
Pietra Ligure SV 10 8992 23931
Pallare SV 11 923 24854
Murialdo SV 11 841 25695
Boissano SV 11 2492 28187
Finale Ligure SV 11 11711 39898
Loano SV 12 11407 51305
Toirano SV 12 2644 53949
Balestrino SV 13 595 54544
Borghetto Santo Spirito SV 13 4948 59492
Plodio SV 13 650 60142
Altare SV 14 2108 62250
Carcare SV 14 5587 67837
Roccavignale SV 14 752 68589
Millesimo SV 15 3383 71972
Cosseria SV 15 1105 73077
Spotorno SV 15 3803 76880
Massimino SV 15 113 76993
Noli SV 15 2736 79729
Erli SV 15 245 79974
Castelvecchio di Rocca Barbena SV 15 145 80119
Quiliano SV 15 7232 87351
Castelnuovo di Ceva CN 16 110 87461
Ceriale SV 16 5561 93022
Perlo CN 16 116 93138
Vado Ligure SV 17 8336 101474
Bergeggi SV 17 1129 102603
Zuccarello SV 17 309 102912
Garessio CN 17 3244 106156
Priola CN 17 701 106857
Bagnasco CN 17 1035 107892
Cengio SV 17 3563 111455
Montezemolo CN 18 259 111714
Cisano sul Neva SV 18 2085 113799
Nucetto CN 18 430 114229
Cairo Montenotte SV 19 13269 127498
Castelbianco SV 19 330 127828
Priero CN 19 529 128357

Municipalities with at least 50000 inhabitants

An earthquake occurred to
21 Km W of Savona (61345 inhabitants)
57 Km E of Cuneo (56081 inhabitants)
59 Km NE of Sanremo (54807 inhabitants)
59 Km W of Genova (586655 inhabitants)
74 Km S of Asti (76202 inhabitants)
81 Km SW of Alessandria (93943 inhabitants)
96 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 3.5
M 3.7 		1993-07-17
07:54:44		 44.237 8.236 10 2013-07-15
08:40:51		 Bollettino Sismico Italiano INGV 191269
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1993-07-17 07:54:44 ± 0.166
Latitude 44.2370 ± 0.0118
Longitude 8.2360 ± 0.0149
Depth (km) 10 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 191269

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) 1770.8
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 43
Number of defining phases 43
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.4
Epicentral distance of station closest to the epicenter (degree) 0.00024
Epicentral distance of station farthest from the epicenter (degree) 0.01595
Number of stations at which the event was observed 23
Number of stations from which data was used for origin computation 23
Magnitudes information

Md:3.5

Field Value
Value 3.5
Uncertainty
Num. used stations 3
Type of magnitude Md
Reference to an origin 191269
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 19:59:40

M:3.7

Field Value
Value 3.7
Uncertainty
Num. used stations
Type of magnitude M
Reference to an origin 191269
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
--.LPG.Z. 1993-07-17T07:55:36.10 10.0 undecidable manual SN 320 1.6317 1.69 0
--.LRG.Z. 1993-07-17T07:55:32.40 10.0 undecidable manual SN 240 1.554 -0.13 0.6
--.LMR.Z. 1993-07-17T07:55:31.80 10.0 undecidable manual SN 234 1.5318 -0.17 0.6
--.BNI.Z. 1993-07-17T07:55:30.10 10.0 undecidable manual SN 306 1.3653 1.93 0
--.LSD.Z. 1993-07-17T07:55:28.80 10.0 undecidable manual SN 328 1.443 -0.84 0.3
--.FRF.Z. 1993-07-17T07:55:27.50 10.0 undecidable manual SN 239 1.3209 0.5 0.5
--.RRL.Z. 1993-07-17T07:55:24.30 10.0 undecidable manual SN 303 1.2321 -0.55 0.5
--.RSP.Z. 1993-07-17T07:55:21.30 10.0 undecidable manual SN 323 1.1433 -1.4 0.1
--.BOB.Z. 1993-07-17T07:55:19.15 10.0 undecidable manual SG 58 1.0101 -0.23 0.7
--.LPG.Z. 1993-07-17T07:55:15.50 10.0 undecidable manual PN! 320 1.6317 2.01 0
--.BDI.Z. 1993-07-17T07:55:14.19 10.0 undecidable manual PN 95 1.6983 -0.14 1.3
--.LPL.Z. 1993-07-17T07:55:14.70 10.0 undecidable manual PN 320 1.665 0.89 0.5
--.BHB.Z. 1993-07-17T07:55:14.10 10.0 undecidable manual SG 311 0.9102 -2.06 0
--.PGF.Z. 1993-07-17T07:55:14.20 10.0 undecidable manual PN 161 1.7649 -1.15 0.3
--.LRG.Z. 1993-07-17T07:55:13.10 10.0 undecidable manual PN 240 1.554 0.7 0.8
--.PZZ.Z. 1993-07-17T07:55:12.80 10.0 undecidable manual SG 288 0.8436 -1.42 0.1
--.LSD.Z. 1993-07-17T07:55:11.47 10.0 undecidable manual PN 328 1.443 0.73 0.8
--.LMR.Z. 1993-07-17T07:55:11.50 10.0 undecidable manual PN 234 1.5318 -0.58 1
--.DOI.Z. 1993-07-17T07:55:10.53 10.0 undecidable manual SG 290 0.7548 -0.59 0.5
--.BNI.Z. 1993-07-17T07:55:10.39 10.0 undecidable manual PN 306 1.3653 0.55 1.1
--.FRF.Z. 1993-07-17T07:55:09.60 10.0 undecidable manual PN 239 1.3209 0.39 1.3
--.RRL.Z. 1993-07-17T07:55:08.22 10.0 undecidable manual PN 303 1.2321 0.25 1.5
--.SBF.Z. 1993-07-17T07:55:08.40 10.0 undecidable manual SG 237 0.6882 -0.44 0.6
--.RSP.Z. 1993-07-17T07:55:06.65 10.0 undecidable manual PN 323 1.1433 -0.08 1.7
--.STV.Z. 1993-07-17T07:55:06.60 10.0 undecidable manual SG 271 0.6438 -1.06 0.2
--.BOB.Z. 1993-07-17T07:55:04.87 10.0 undecidable manual PG 58 1.0101 0.06 1.8
--.ENR.Z. 1993-07-17T07:55:04.70 10.0 undecidable manual SG 269 0.5772 -0.88 0.3
--.BHB.Z. 1993-07-17T07:55:02.86 10.0 undecidable manual PG 311 0.9102 -0.09 1.9
--.PZZ.Z. 1993-07-17T07:55:01.81 10.0 undecidable manual PG 288 0.8436 -0.02 1.9
--.IMI.Z. 1993-07-17T07:54:59.20 10.0 undecidable manual SG 217 0.3996 -0.74 0.4
--.SBF.Z. 1993-07-17T07:54:59.40 10.0 undecidable manual PG 237 0.6882 0.67 1.1
--.DOI.Z. 1993-07-17T07:54:59.92 10.0 undecidable manual PG 290 0.7548 -0.13 1.9
--.PCP.Z. 1993-07-17T07:54:58.00 10.0 undecidable manual SG 35 0.3663 -0.89 0.3
--.STV.Z. 1993-07-17T07:54:58.79 10.0 undecidable manual PG 271 0.6438 0.75 1
--.ENR.Z. 1993-07-17T07:54:57.40 10.0 undecidable manual PG 269 0.5772 0.2 1.8
--.ROB.Z. 1993-07-17T07:54:54.40 10.0 undecidable manual SG 284 0.2553 -1.02 0.2
--.IMI.Z. 1993-07-17T07:54:53.44 10.0 positive manual PG 217 0.3996 -0.15 3.7
--.PCP.Z. 1993-07-17T07:54:52.65 10.0 positive manual PG 35 0.3663 -0.33 3.3
--.CKI.Z. 1993-07-17T07:54:52.50 10.0 undecidable manual SG 9 0.1776 -0.28 0.7
--.ROB.Z. 1993-07-17T07:54:51.40 10.0 negative manual PG 284 0.2553 0.06 3.8
--.CKI.Z. 1993-07-17T07:54:49.80 10.0 undecidable manual PG 9 0.1776 0.35 1.6
--.FIN.Z. 1993-07-17T07:54:48.30 10.0 undecidable manual SG 214 0.0222 -0.33 0.7
--.FIN.Z. 1993-07-17T07:54:47.31 10.0 undecidable manual PG 214 0.0222 0.25 1.8
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, /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