Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.8 on date 23-04-2023 and time 07:07:26 (Italy) in region 5 km NW Castel del Rio (BO)

A magnitude ML 1.8 earthquake occured in region: 5 km NW Castel del Rio (BO), on

  • 23-04-2023 05:07:26 (UTC)
  • 23-04-2023 07:07:26 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.2380, 11.4580 at 22 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
Castel del Rio BO 5 1246 1246
Fontanelice BO 8 1943 3189
Monterenzio BO 11 6035 9224
Monghidoro BO 11 3749 12973
Loiano BO 11 4294 17267
Borgo Tossignano BO 12 3288 20555
Casola Valsenio RA 13 2617 23172
Casalfiumanese BO 14 3438 26610
Firenzuola FI 15 4726 31336
Monzuno BO 15 6328 37664
Palazzuolo sul Senio FI 16 1154 38818
San Benedetto Val di Sambro BO 18 4315 43133
Pianoro BO 19 17460 60593
Dozza BO 19 6652 67245

Municipalities with at least 50000 inhabitants

An earthquake occurred to
24 Km SW of Imola (69797 inhabitants)
30 Km SE of Bologna (386663 inhabitants)
34 Km W of Faenza (58541 inhabitants)
47 Km W of Forlì (117913 inhabitants)
49 Km NE of Prato (191150 inhabitants)
54 Km NE of Firenze (382808 inhabitants)
55 Km NE of Pistoia (90315 inhabitants)
58 Km NE of Scandicci (50609 inhabitants)
62 Km SE of Modena (184973 inhabitants)
62 Km W of Ravenna (159116 inhabitants)
64 Km W of Cesena (96758 inhabitants)
68 Km S of Ferrara (133155 inhabitants)
76 Km SE of Carpi (70699 inhabitants)
83 Km SE of Reggio nell'Emilia (171345 inhabitants)
88 Km E of Lucca (89046 inhabitants)
91 Km W of Rimini (147750 inhabitants)
92 Km NW of Arezzo (99543 inhabitants)
96 Km S of Rovigo (51867 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 		ML 1.8 2023-04-23
05:07:26		 44.2377 11.458 22 2024-03-01
17:18:10		 Bollettino Sismico Italiano INGV 117949191
Reviewed
Rev100 		ML 1.7 2023-04-23
05:07:26		 44.218 11.4617 20 2023-04-23
05:16:23		 Sala Sismica INGV-Roma 116631851
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-04-23 05:07:26 ± 0.13
Latitude 44.2377 ± 0.0072
Longitude 11.4580 ± 0.0100
Depth (km) 22 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 117949191

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 855
Semi-minor axis of confidence ellipse (meter) 184
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 65
Circular confidence region, given by single value of horizontal uncertainty (meter) 860.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 73
Number of associated phases, regardless of their use for origin computation 37
Number of defining phases 37
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.41
Epicentral distance of station closest to the epicenter (degree) 0.05126
Epicentral distance of station farthest from the epicenter (degree) 2.07743
Number of stations at which the event was observed 27
Number of stations from which data was used for origin computation 27
Magnitudes information

ML:1.8

Field Value
Value 1.8
Uncertainty 0.4
Num. used stations 50
Type of magnitude ML
Reference to an origin 117949191
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2024-02-09 10:58:29

ML:1.7

Field Value
Value 1.7
Uncertainty 0.3
Num. used stations 46
Type of magnitude ML
Reference to an origin 116631851
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-04-23 05:16:23
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
OX.MLN.HHZ. 2023-04-23T05:07:58.82 0.3 undecidable manual P 23 230.5914 54 -1.78 18
IV.MAGA.HHZ. 2023-04-23T05:07:55.41 0.3 undecidable manual P 339 182.5839 54 0.78 40
ST.DOSS.HHZ. 2023-04-23T05:07:53.79 1.0 undecidable manual P 353 183.483 54 -0.95 13
OX.MARN.HHZ. 2023-04-23T05:07:51.57 0.3 undecidable manual P 353 156.5211 54 0.18 55
IV.ZOVE.EHZ. 2023-04-23T05:07:48.32 0.3 undecidable manual P 1 134.865 95 -0.26 58
IV.CAFI.HHZ. 2023-04-23T05:07:45.31 0.3 undecidable manual P 158 108.7134 97 0.75 52
IV.PIEI.HHZ. 2023-04-23T05:07:45.90 0.3 undecidable manual P 132 116.0949 96 0.2 60
IV.PII.HHZ. 2023-04-23T05:07:42.68 0.3 undecidable manual P 233 93.9393 98 0.38 61
IV.SFI.EHZ. 2023-04-23T05:07:42.86 0.3 undecidable manual S 140 48.2184 107 0.79 57
IV.PARC.HHZ. 2023-04-23T05:07:41.60 0.1 undecidable manual P 136 90.3429 98 -0.16 87
IV.CRE.HHZ. 2023-04-23T05:07:40.56 0.3 undecidable manual P 150 79.1652 100 0.5 61
IV.CSNT.HHZ. 2023-04-23T05:07:40.49 0.6 undecidable manual P 189 85.8474 99 -0.59 39
IV.BOSL.HHZ. 2023-04-23T05:07:39.22 0.6 undecidable manual S 191 34.6431 115 0.53 44
IV.BDI.HHZ. 2023-04-23T05:07:39.46 0.3 undecidable manual P 255 71.373 101 0.59 61
IV.VMGN.HHZ. 2023-04-23T05:07:38.60 0.6 undecidable manual S 169 31.9458 117 0.56 44
IV.MOCL.EHZ. 2023-04-23T05:07:38.79 0.6 undecidable manual S 221 33.9438 115 0.27 47
IV.IMOL.EHZ. 2023-04-23T05:07:37.36 0.6 undecidable manual S 59 26.3514 123 0.62 43
IV.CRMI.HHZ. 2023-04-23T05:07:37.63 0.3 undecidable manual P 218 62.0934 103 0.15 68
IV.FNVD.HHZ. 2023-04-23T05:07:37.55 0.3 undecidable manual S 254 27.75 121 0.49 68
IV.LMD.HHZ. 2023-04-23T05:07:36.79 0.6 undecidable manual S 132 26.6511 123 -0.02 50
4P.IT09A.HHE. 2023-04-23T05:07:35.99 0.3 undecidable manual P 358 46.9197 108 0.77 58
IV.SEI.HHZ. 2023-04-23T05:07:35.82 0.3 undecidable manual S 201 21.867 129 0.05 75
IV.MTRZ.HHZ. 2023-04-23T05:07:34.56 0.3 undecidable manual S 342 8.7801 156 0.96 59
IV.ZCCA.HHZ. 2023-04-23T05:07:34.50 0.3 undecidable manual P 288 40.2264 111 0.26 70
IV.SFI.EHZ. 2023-04-23T05:07:34.98 0.1 undecidable manual P 140 48.2184 107 -0.42 89
IV.RUFI.EHZ. 2023-04-23T05:07:34.94 0.3 undecidable manual P 175 44.5221 109 0.08 71
IV.MPPT.EHZ. 2023-04-23T05:07:34.11 0.3 undecidable manual P 223 42.7239 110 -0.49 65
IV.BOSL.HHZ. 2023-04-23T05:07:33.38 0.1 undecidable manual P 191 34.6431 115 -0.07 97
IV.MOCL.EHZ. 2023-04-23T05:07:32.94 0.3 undecidable manual P 221 33.9438 115 -0.41 68
IV.IMOL.EHZ. 2023-04-23T05:07:32.12 0.3 undecidable manual P 59 26.3514 123 -0.21 72
IV.VMGN.HHZ. 2023-04-23T05:07:32.95 0.1 undecidable manual P 169 31.9458 117 -0.13 97
IV.VISG.HHZ. 2023-04-23T05:07:32.89 0.3 undecidable manual S 199 5.6943 164 -0.43 70
IV.LMD.HHZ. 2023-04-23T05:07:31.82 0.1 undecidable manual P 132 26.6511 123 -0.54 89
IV.SEI.HHZ. 2023-04-23T05:07:31.34 0.1 undecidable manual P 201 21.867 129 -0.43 92
IV.FNVD.HHZ. 2023-04-23T05:07:31.66 0.1 undecidable manual P 254 27.75 121 -0.85 77
IV.MTRZ.HHZ. 2023-04-23T05:07:30.39 0.1 undecidable manual P 342 8.7801 156 -0.12 100
IV.VISG.HHZ. 2023-04-23T05:07:29.75 0.1 undecidable manual P 199 5.6943 164 -0.6 89
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.VISG.HHN. ML:2.3 0.00151 0.5 AML other m 2023-04-23T05:07:33.30
IV.VISG.HHE. ML:2.5 0.0020600709999999997 0.1376 AML other m 2023-04-23T05:07:33.12
IV.MTRZ.HHE. ML:2.7 0.003615 0.56 AML other m 2023-04-23T05:07:35.44
IV.MTRZ.HNE. ML:2.7 0.003475 0.56 AML other m 2023-04-23T05:07:35.44
IV.MTRZ.HHN. ML:2.7 0.003765 0.22 AML other m 2023-04-23T05:07:35.86
IV.MTRZ.HNN. ML:2.7 0.0035650000000000005 0.22 AML other m 2023-04-23T05:07:35.86
IV.SEI.HHN. ML:2.4 0.0011275 0.2 AML other m 2023-04-23T05:07:36.31
IV.SEI.HHE. ML:2.0 0.0005415 0.4 AML other m 2023-04-23T05:07:36.44
IV.LMD.HHE. ML:1.9 0.00035999999999999997 0.3 AML other m 2023-04-23T05:07:37.07
IV.LMD.HHN. ML:2.0 0.00040249999999999997 1.14 AML other m 2023-04-23T05:07:37.28
IV.FNVD.HHE. ML:1.9 0.00032799999999999995 1.06 AML other m 2023-04-23T05:07:37.44
IV.FNVD.HHN. ML:2.0 0.000456 0.5 AML other m 2023-04-23T05:07:38.69
IV.VMGN.HHE. ML:1.4 0.00009295000000000001 0.54 AML other m 2023-04-23T05:07:39.52
IV.VMGN.HHN. ML:1.5 0.0001185 0.46 AML other m 2023-04-23T05:07:40.00
IV.BOSL.HHN. ML:1.3 0.00007085 1.14 AML other m 2023-04-23T05:07:40.90
IV.BOSL.HHE. ML:1.3 0.0000708 0.28 AML other m 2023-04-23T05:07:40.21
IV.SFI.EHE. ML:1.8 0.000154 0.62 AML other m 2023-04-23T05:07:43.66
IV.MPPT.EHN. ML:1.3 0.000059999999999999995 0.58 AML other m 2023-04-23T05:07:44.71
IV.SFI.HNE. ML:1.8 0.0001751474 0.8704 AML other m 2023-04-23T05:07:45.66
IV.SFI.EHN. ML:1.6 0.00008995 0.68 AML other m 2023-04-23T05:07:45.59
IV.MPPT.EHE. ML:1.3 0.00005785 1.06 AML other m 2023-04-23T05:07:46.11
IV.SFI.HNN. ML:1.8 0.00014852365000000002 0.72 AML other m 2023-04-23T05:07:47.65
IV.ZCCA.HHN. ML:1.3 0.0000639 0.4 AML other m 2023-04-23T05:07:47.47
IV.CRMI.HHN. ML:1.4 0.0000455 0.58 AML other m 2023-04-23T05:07:49.07
IV.CRMI.HHE. ML:1.1 0.000023449999999999997 0.36 AML other m 2023-04-23T05:07:50.62
IV.BDI.HHE. ML:1.7 0.0000845 0.32 AML other m 2023-04-23T05:07:52.19
IV.ZCCA.HHE. ML:1.4 0.00007085 0.42 AML other m 2023-04-23T05:07:52.49
IV.BDI.HHN. ML:1.8 0.00009120000000000001 0.48 AML other m 2023-04-23T05:07:52.56
IV.CSNT.HHE. ML:1.4 0.000031150000000000005 0.42 AML other m 2023-04-23T05:07:53.88
IV.CSNT.HHN. ML:1.4 0.000031799999999999994 0.56 AML other m 2023-04-23T05:07:54.31
IV.PII.HHN. ML:1.8 0.00006840000000000001 0.5 AML other m 2023-04-23T05:07:58.19
IV.PARC.HHN. ML:1.5 0.0000332 0.64 AML other m 2023-04-23T05:07:58.66
IV.PII.HHE. ML:1.7 0.0000552 1.42 AML other m 2023-04-23T05:07:58.26
IV.CRE.HHN. ML:1.7 0.00006335 1.54 AML other m 2023-04-23T05:07:59.17
IV.CRE.HHE. ML:1.6 0.00004825 1.34 AML other m 2023-04-23T05:08:00.96
IV.PARC.HHE. ML:1.5 0.0000362 0.4 AML other m 2023-04-23T05:08:01.44
IV.CAFI.HHE. ML:1.6 0.0000356 0.4 AML other m 2023-04-23T05:08:04.44
IV.CAFI.HHN. ML:1.5 0.000027400000000000002 0.98 AML other m 2023-04-23T05:08:05.04
IV.PIEI.HHN. ML:1.4 0.000019050000000000002 1.06 AML other m 2023-04-23T05:08:07.09
IV.PIEI.HHE. ML:1.5 0.0000229 1.08 AML other m 2023-04-23T05:08:07.11
IV.MURB.HHE. ML:2.1 0.0000756 0.26 AML other m 2023-04-23T05:08:13.59
OX.MARN.HHN. ML:2.1 0.0000547 0.26 AML other m 2023-04-23T05:08:14.74
IV.FRON.EHE. ML:1.7 0.000032149999999999995 0.88 AML other m 2023-04-23T05:08:14.80
IV.MURB.HHN. ML:1.9 0.000052000000000000004 0.84 AML other m 2023-04-23T05:08:15.38
OX.MARN.HHE. ML:2.0 0.0000467 0.42 AML other m 2023-04-23T05:08:17.64
IV.FRON.EHN. ML:2.0 0.00006455 0.58 AML other m 2023-04-23T05:08:18.53
ST.DOSS.HHE. ML:2.3 0.00007035 0.44 AML other m 2023-04-23T05:08:19.01
IV.MAGA.HHE. ML:2.7 0.00017449999999999999 0.64 AML other m 2023-04-23T05:08:20.55
IV.MAGA.HHN. ML:2.4 0.0000917 1.74 AML other m 2023-04-23T05:08:21.92
ST.DOSS.HHN. ML:2.1 0.00004235 1.56 AML other m 2023-04-23T05:08:25.15
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