Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of Md 4.2 on date 17-07-1993 and time 12:35:00 (Italy) in region Costa Ligure centro occidentale (Savona)

A magnitude Md 4.2 earthquake occured in region: Costa Ligure centro occidentale (Savona), on

  • 17-07-1993 10:35:00 (UTC)
  • 17-07-1993 12:35:00 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.1470, 8.2900 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.

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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
Pietra Ligure SV 1 8992 8992
Borgio Verezzi SV 2 2205 11197
Loano SV 3 11407 22604
Tovo San Giacomo SV 4 2582 25186
Giustenice SV 5 977 26163
Finale Ligure SV 5 11711 37874
Borghetto Santo Spirito SV 5 4948 42822
Boissano SV 6 2492 45314
Magliolo SV 6 974 46288
Calice Ligure SV 7 1730 48018
Toirano SV 7 2644 50662
Ceriale SV 7 5561 56223
Rialto SV 8 564 56787
Orco Feglino SV 9 890 57677
Balestrino SV 9 595 58272
Vezzi Portio SV 11 809 59081
Noli SV 12 2736 61817
Albenga SV 12 24213 86030
Cisano sul Neva SV 13 2085 88115
Bardineto SV 14 756 88871
Spotorno SV 14 3803 92674
Castelvecchio di Rocca Barbena SV 14 145 92819
Zuccarello SV 14 309 93128
Erli SV 15 245 93373
Bormida SV 15 387 93760
Villanova d'Albenga SV 16 2657 96417
Mallare SV 16 1146 97563
Arnasco SV 16 645 98208
Osiglia SV 17 444 98652
Bergeggi SV 17 1129 99781
Calizzano SV 17 1475 101256
Castelbianco SV 18 330 101586
Alassio SV 18 10934 112520
Vado Ligure SV 18 8336 120856
Ortovero SV 19 1586 122442
Vendone SV 19 388 122830
Quiliano SV 19 7232 130062
Garlenda SV 20 1254 131316

Municipalities with at least 50000 inhabitants

An earthquake occurred to
24 Km SW of Savona (61345 inhabitants)
54 Km NE of Sanremo (54807 inhabitants)
59 Km W of Genova (586655 inhabitants)
65 Km E of Cuneo (56081 inhabitants)
84 Km S of Asti (76202 inhabitants)
89 Km SW of Alessandria (93943 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 4.2
M 4.5 		1993-07-17
10:35:00		 44.147 8.29 7 2013-07-15
08:40:51		 Bollettino Sismico Italiano INGV 191329
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1993-07-17 10:35:00 ± 0.282
Latitude 44.1470 ± 0.0115
Longitude 8.2900 ± 0.0112
Depth (km) 7 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 191329

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) 1562.9
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 68
Number of associated phases, regardless of their use for origin computation 111
Number of defining phases 111
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.6
Epicentral distance of station closest to the epicenter (degree) 0.00073
Epicentral distance of station farthest from the epicenter (degree) 0.08653
Number of stations at which the event was observed 86
Number of stations from which data was used for origin computation 86
Magnitudes information

Md:4.2

Field Value
Value 4.2
Uncertainty
Num. used stations 2
Type of magnitude Md
Reference to an origin 191329
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 19:59:44

M:4.5

Field Value
Value 4.5
Uncertainty
Num. used stations
Type of magnitude M
Reference to an origin 191329
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
--.SPC.Z. 1993-07-17T10:37:19.10 10.0 undecidable manual PN 53 9.6015 0.42 0.7
--.RJF.Z. 1993-07-17T10:37:10.70 10.0 undecidable manual SN 285 4.9284 1.61 0.1
--.LJU.Z. 1993-07-17T10:37:05.50 10.0 undecidable manual SN 64 4.7841 0.09 0.5
--.TCF.Z. 1993-07-17T10:37:05.20 10.0 undecidable manual SN 298 4.773 -0.06 0.5
--.CEY.Z. 1993-07-17T10:37:01.00 10.0 undecidable manual SN 67 4.6176 -0.41 0.4
--.BGF.Z. 1993-07-17T10:37:00.70 10.0 undecidable manual SN 304 4.5066 1.77 0
--.LOR.Z. 1993-07-17T10:36:56.50 10.0 undecidable manual SN 316 4.3845 0.57 0.4
--.VOY.Z. 1993-07-17T10:36:55.20 10.0 undecidable manual SN 62 4.3623 -0.42 0.4
--.GRR.Z. 1993-07-17T10:36:51.50 10.0 undecidable manual PN 307 7.5924 0.41 0.8
--.LBF.Z. 1993-07-17T10:36:50.80 10.0 undecidable manual SN 314 4.1292 0.85 0.3
--.TRI.Z. 1993-07-17T10:36:49.44 10.0 undecidable manual SN 66 4.1736 -1.34 0.1
--.HAU.Z. 1993-07-17T10:36:46.80 10.0 undecidable manual SN 341 4.0737 -1.82 0.1
--.SMF.Z. 1993-07-17T10:36:46.70 10.0 undecidable manual SN 310 3.9849 0.15 0.5
--.VKA.Z. 1993-07-17T10:36:41.80 10.0 negative manual PN 50 6.9042 0.27 2
--.SOP.Z. 1993-07-17T10:36:39.30 10.0 positive manual PN 55 6.7377 0.01 2.1
--.MFF.Z. 1993-07-17T10:36:35.80 10.0 undecidable manual PN 295 6.3936 1.16 0.4
--.DOU.Z. 1993-07-17T10:36:35.80 10.0 undecidable manual PN 338 6.438 0.52 0.9
--.ASS.Z. 1993-07-17T10:36:32.69 10.0 undecidable manual SN 107 3.33 1.84 0.1
--.TNS.Z. 1993-07-17T10:36:31.80 10.0 undecidable manual PN 0 6.0606 1.74 0.1
--.KHC.Z. 1993-07-17T10:36:30.50 10.0 undecidable manual PN 34 6.1494 -0.77 0.7
--.EPF.Z. 1993-07-17T10:36:28.00 10.0 undecidable manual PN 261 5.8497 0.89 0.6
--.GRF.Z. 1993-07-17T10:36:26.50 10.0 undecidable manual PN 18 5.883 -1.06 0.5
--.CTI.Z. 1993-07-17T10:36:23.37 10.0 undecidable manual SN 50 3.0303 -0.37 0.6
--.LFF.Z. 1993-07-17T10:36:21.80 10.0 undecidable manual PN 280 5.4279 0.5 0.9
--.LSF.Z. 1993-07-17T10:36:19.00 10.0 undecidable manual PN 296 5.1948 0.9 0.6
--.LPO.Z. 1993-07-17T10:36:17.40 10.0 undecidable manual PN 278 5.0838 0.75 0.8
--.CRE.Z. 1993-07-17T10:36:15.50 10.0 undecidable manual SN 99 2.6751 0.06 0.6
--.RJF.Z. 1993-07-17T10:36:15.30 10.0 undecidable manual PN 285 4.9284 0.74 0.8
--.LJU.Z. 1993-07-17T10:36:13.00 10.0 undecidable manual PN 64 4.7841 0.56 1.1
--.BHG.Z. 1993-07-17T10:36:13.80 10.0 undecidable manual PN 40 4.7841 1.38 0.4
--.TCF.Z. 1993-07-17T10:36:12.90 10.0 undecidable manual PN 298 4.773 0.54 1
--.CEY.Z. 1993-07-17T10:36:11.50 10.0 undecidable manual PN 67 4.6176 1.37 0.4
--.SFI.Z. 1993-07-17T10:36:11.58 10.0 undecidable manual SN 94 2.5641 -0.98 0.2
--.KBA.Z. 1993-07-17T10:36:10.90 10.0 positive manual PN 48 4.5843 1.21 1.1
--.CAF.Z. 1993-07-17T10:36:09.10 10.0 undecidable manual PN 282 4.4955 0.63 0.9
--.MAF.Z. 1993-07-17T10:36:09.10 10.0 undecidable manual PN 299 4.5288 0.2 1.3
--.FUR.Z. 1993-07-17T10:36:09.60 10.0 positive manual PN 26 4.5066 0.91 1.5
--.BGF.Z. 1993-07-17T10:36:08.80 10.0 undecidable manual PN 304 4.5066 0.1 1.3
--.SSF.Z. 1993-07-17T10:36:07.80 10.0 undecidable manual PN 312 4.4289 0.24 1.3
--.RBL.Z. 1993-07-17T10:36:06.47 10.0 undecidable manual PN 56 4.3512 -0.07 1.4
--.LOR.Z. 1993-07-17T10:36:06.90 10.0 undecidable manual PN 316 4.3845 -0.07 1.4
--.AVF.Z. 1993-07-17T10:36:06.40 10.0 undecidable manual PN 309 4.3512 -0.04 1.4
--.VOY.Z. 1993-07-17T10:36:06.20 10.0 undecidable manual PN 62 4.3623 -0.59 1
--.AQU.Z. 1993-07-17T10:36:05.50 10.0 undecidable manual PN 113 4.1292 2.13 0.1
--.CDF.Z. 1993-07-17T10:36:04.97 10.0 undecidable manual PN 350 4.3179 -1.01 0.7
--.WLS.Z. 1993-07-17T10:36:04.99 10.0 undecidable manual PN 351 4.3068 -0.89 0.9
--.SAL.Z. 1993-07-17T10:36:03.00 10.0 undecidable manual SN 46 2.1423 0.28 0.6
--.TRI.Z. 1993-07-17T10:36:03.60 10.0 undecidable manual PN 66 4.1736 -0.94 0.7
--.LBF.Z. 1993-07-17T10:36:03.90 10.0 undecidable manual PN 314 4.1292 0.38 1.2
--.FVI.Z. 1993-07-17T10:36:02.14 10.0 undecidable manual PN 50 3.9849 0.69 1.1
--.HAU.Z. 1993-07-17T10:36:02.40 10.0 undecidable manual PN 341 4.0737 -0.35 1.4
--.ECH.Z. 1993-07-17T10:36:02.96 10.0 undecidable manual PN 349 4.1292 -0.57 1.2
--.SMF.Z. 1993-07-17T10:36:01.60 10.0 undecidable manual PN 310 3.9849 0.05 1.4
--.GE9.Z. 1993-07-17T10:36:01.86 10.0 undecidable manual PN 56 4.0182 -0.06 1.4
--.BSF.Z. 1993-07-17T10:35:58.83 10.0 undecidable manual PN 344 3.8184 -0.38 1.4
--.MOF.Z. 1993-07-17T10:35:58.37 10.0 undecidable manual PN 348 3.7851 -0.32 1.4
--.FEL.Z. 1993-07-17T10:35:57.82 10.0 undecidable manual PN 357 3.7185 -0.07 1.5
--.MNS.Z. 1993-07-17T10:35:57.22 10.0 undecidable manual PN 117 3.6408 0.46 1.4
--.SLE.Z. 1993-07-17T10:35:56.20 10.0 positive manual PN 2 3.6075 -0.17 3
--.ARV.Z. 1993-07-17T10:35:54.30 10.0 undecidable manual PN 99 3.4077 0.45 1.5
--.ZLA.Z. 1993-07-17T10:35:53.00 10.0 undecidable manual PN 0 3.33 0.57 1.2
--.BBS.Z. 1993-07-17T10:35:53.45 10.0 undecidable manual PN 350 3.3522 0.64 1.1
--.LPG.Z. 1993-07-17T10:35:52.10 10.0 undecidable manual SN 321 1.7205 -0.67 0.5
--.ASS.Z. 1993-07-17T10:35:52.67 10.0 undecidable manual PN 107 3.33 0.18 1.6
--.LPL.Z. 1993-07-17T10:35:51.80 10.0 undecidable manual SN 321 1.7538 -1.52 0.2
--.RSM.Z. 1993-07-17T10:35:50.11 10.0 undecidable manual PN! 92 2.997 2.29 0
--.PII.Z. 1993-07-17T10:35:49.64 10.0 undecidable manual SN 103 1.6539 -1.41 0.1
--.BDI.Z. 1993-07-17T10:35:49.00 10.0 undecidable manual SN 92 1.6539 -1.92 0
--.CTI.Z. 1993-07-17T10:35:48.44 10.0 positive manual PN 50 3.0303 0.06 3.2
--.LRG.Z. 1993-07-17T10:35:48.10 10.0 undecidable manual SN 244 1.5429 -0.35 0.6
--.OSS.Z. 1993-07-17T10:35:47.40 10.0 undecidable manual PN 26 2.8527 1.56 0.3
--.ORO.Z. 1993-07-17T10:35:46.15 10.0 undecidable manual SN 351 1.4874 -0.93 0.4
--.LMR.Z. 1993-07-17T10:35:46.60 10.0 undecidable manual SN 238 1.5207 -1.06 0.3
--.LSD.Z. 1993-07-17T10:35:45.60 10.0 undecidable manual SN! 328 1.5318 -2.46 0
--.LLS.Z. 1993-07-17T10:35:44.50 10.0 positive manual PN 10 2.7417 0.11 3.2
--.CRE.Z. 1993-07-17T10:35:43.69 10.0 undecidable manual PN 99 2.6751 0.1 1.6
--.FRF.Z. 1993-07-17T10:35:42.40 10.0 undecidable manual SN 244 1.3098 -0.51 0.6
--.SFI.Z. 1993-07-17T10:35:41.54 10.0 undecidable manual PN 94 2.5641 -0.39 1.3
--.VDL.Z. 1993-07-17T10:35:41.60 10.0 positive manual PN 19 2.4753 0.87 1.9
--.PGD.Z. 1993-07-17T10:35:40.18 10.0 undecidable manual PN 95 2.4753 -0.56 1.2
--.FIR.Z. 1993-07-17T10:35:36.00 10.0 undecidable manual PN 98 2.1534 -0.4 1.3
--.SAL.Z. 1993-07-17T10:35:36.81 10.0 undecidable manual PN 46 2.1423 0.56 1.3
--.ZC9.Z. 1993-07-17T10:35:35.34 10.0 undecidable manual PN 82 1.9314 2.1 0.1
--.TMA.Z. 1993-07-17T10:35:34.10 10.0 positive manual PN 11 1.998 -0.04 3.2
--.DIX.Z. 1993-07-17T10:35:34.50 10.0 undecidable manual PN 342 2.0202 -0.04 1.6
--.MMK.Z. 1993-07-17T10:35:32.40 10.0 positive manual PN 353 1.9092 -0.6 2.6
--.LPL.Z. 1993-07-17T10:35:31.10 10.0 undecidable manual PN 321 1.7538 0.29 1.5
--.LPG.Z. 1993-07-17T10:35:30.50 10.0 undecidable manual PN 321 1.7205 0 1.6
--.VAI.Z. 1993-07-17T10:35:30.60 10.0 undecidable manual PN 10 1.7427 -0.13 1.6
--.GU9.Z. 1993-07-17T10:35:29.69 10.0 undecidable manual PN 82 1.6539 0.26 1.6
--.PGF.Z. 1993-07-17T10:35:28.76 10.0 undecidable manual PN 161 1.6761 -0.96 0.7
--.LRG.Z. 1993-07-17T10:35:28.30 10.0 undecidable manual PN 244 1.5429 0.29 1.5
--.PII.Z. 1993-07-17T10:35:28.79 10.0 negative manual PN 103 1.6539 -0.72 2
--.BDI.Z. 1993-07-17T10:35:28.49 10.0 undecidable manual PN 92 1.6539 -0.95 0.7
--.LMR.Z. 1993-07-17T10:35:27.50 10.0 undecidable manual PN 238 1.5207 -0.05 1.6
--.LSD.Z. 1993-07-17T10:35:26.36 10.0 undecidable manual PN 328 1.5318 -1.42 0.5
--.ORO.Z. 1993-07-17T10:35:26.27 10.0 undecidable manual PN 351 1.4874 -0.95 0.9
--.NO1.Z. 1993-07-17T10:35:25.10 10.0 undecidable manual PN 10 1.2987 0.48 2.7
--.FRF.Z. 1993-07-17T10:35:24.80 10.0 undecidable manual PN 244 1.3098 -0.01 1.6
--.RRL.Z. 1993-07-17T10:35:23.31 10.0 negative manual PN 306 1.3209 -1.52 0.4
--.RSP.Z. 1993-07-17T10:35:21.81 10.0 undecidable manual PN 324 1.2432 -1.95 0.1
--.BOB.Z. 1993-07-17T10:35:19.96 10.0 positive manual PG 52 1.0212 -0.75 2
--.BHB.Z. 1993-07-17T10:35:17.82 10.0 undecidable manual PG! 313 0.999 -2.35 0
--.PZZ.Z. 1993-07-17T10:35:16.65 10.0 negative manual PG 293 0.9213 -2.01 0.1
--.SBF.Z. 1993-07-17T10:35:13.81 10.0 undecidable manual PG 245 0.6771 -0.3 1.6
--.STV.Z. 1993-07-17T10:35:12.53 10.0 negative manual PG 278 0.6882 -1.93 0.2
--.ENR.Z. 1993-07-17T10:35:11.86 10.0 undecidable manual PG 277 0.6216 -1.35 0.6
--.IMI.Z. 1993-07-17T10:35:08.64 10.0 positive manual PG 230 0.3663 0.23 1.5
--.PCP.Z. 1993-07-17T10:35:08.12 10.0 positive manual PG 24 0.4329 -1.5 0.3
--.ROB.Z. 1993-07-17T10:35:06.21 10.0 negative manual PG 297 0.333 -1.47 0.5
--.FIN.Z. 1993-07-17T10:35:02.40 10.0 undecidable manual PG 316 0.0777 0.02 1.6
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