Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.7 on date 23-04-2023 and time 06:02:47 (Italy) in region 6 km NW Castel del Rio (BO)

A magnitude ML 1.7 earthquake occured in region: 6 km NW Castel del Rio (BO), on

  • 23-04-2023 04:02:47 (UTC)
  • 23-04-2023 06:02:47 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.2520, 11.4600 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 6 1246 1246
Fontanelice BO 8 1943 3189
Monterenzio BO 9 6035 9224
Borgo Tossignano BO 11 3288 12512
Loiano BO 11 4294 16806
Monghidoro BO 12 3749 20555
Casola Valsenio RA 13 2617 23172
Casalfiumanese BO 14 3438 26610
Monzuno BO 15 6328 32938
Firenzuola FI 16 4726 37664
Palazzuolo sul Senio FI 17 1154 38818
Pianoro BO 18 17460 56278
Dozza BO 18 6652 62930
San Benedetto Val di Sambro BO 18 4315 67245
Castel San Pietro Terme BO 19 20811 88056

Municipalities with at least 50000 inhabitants

An earthquake occurred to
23 Km W of Imola (69797 inhabitants)
29 Km SE of Bologna (386663 inhabitants)
34 Km W of Faenza (58541 inhabitants)
46 Km W of Forlì (117913 inhabitants)
50 Km NE of Prato (191150 inhabitants)
56 Km NE of Pistoia (90315 inhabitants)
56 Km NE of Firenze (382808 inhabitants)
59 Km NE of Scandicci (50609 inhabitants)
61 Km SE of Modena (184973 inhabitants)
62 Km W of Ravenna (159116 inhabitants)
64 Km W of Cesena (96758 inhabitants)
66 Km S of Ferrara (133155 inhabitants)
75 Km SE of Carpi (70699 inhabitants)
82 Km SE of Reggio nell'Emilia (171345 inhabitants)
89 Km NE of Lucca (89046 inhabitants)
91 Km W of Rimini (147750 inhabitants)
94 Km NW of Arezzo (99543 inhabitants)
95 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 1.7 2023-04-23
04:02:47		 44.2518 11.4603 22 2024-03-01
17:18:05		 Bollettino Sismico Italiano INGV 116954151
Reviewed
Rev100 		ML 1.7 2023-04-23
04:02:47		 44.2158 11.4525 24 2023-04-23
04:08:19		 Sala Sismica INGV-Roma 116630971
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-04-23 04:02:47 ± 0.3
Latitude 44.2518 ± 0.0099
Longitude 11.4603 ± 0.0138
Depth (km) 22 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 116954151

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1158
Semi-minor axis of confidence ellipse (meter) 562
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 239
Circular confidence region, given by single value of horizontal uncertainty (meter) 1160.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 85
Number of associated phases, regardless of their use for origin computation 23
Number of defining phases 23
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) 0.06565
Epicentral distance of station farthest from the epicenter (degree) 0.57197
Number of stations at which the event was observed 14
Number of stations from which data was used for origin computation 14
Magnitudes information

ML:1.7

Field Value
Value 1.7
Uncertainty 0.4
Num. used stations 12
Type of magnitude ML
Reference to an origin 116630971
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-04-23 04:08:19

ML:1.7

Field Value
Value 1.7
Uncertainty 0.3
Num. used stations 12
Type of magnitude ML
Reference to an origin 116954151
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2024-02-09 10:53:34
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.SFI.EHZ. 2023-04-23T04:03:04.44 0.3 undecidable manual S 141 49.3173 107 0.88 53
IV.BOSL.HHE. 2023-04-23T04:03:00.82 0.6 undecidable manual S 191 36.2415 114 0.53 42
IV.MOCL.EHZ. 2023-04-23T04:03:00.11 0.3 undecidable manual S 219 35.3424 115 0.05 71
IV.CRMI.HNN. 2023-04-23T04:02:59.71 0.3 undecidable manual P 217 63.492 102 0.82 54
IV.VMGN.HHN. 2023-04-23T04:02:59.89 0.3 undecidable manual S 170 33.4443 116 0.27 68
IV.LMD.HHE. 2023-04-23T04:02:58.30 0.6 undecidable manual S 134 27.5502 122 0.06 48
IV.FNVD.HHZ. 2023-04-23T04:02:58.60 0.3 undecidable manual S 251 28.4493 121 0.17 71
IV.SEI.HHZ. 2023-04-23T04:02:57.23 0.3 undecidable manual S 200 23.3544 127 -0.09 73
IV.RUFI.EHE. 2023-04-23T04:02:56.51 0.3 undecidable manual P 175 46.1205 108 0.21 67
IV.SFI.EHZ. 2023-04-23T04:02:56.38 0.3 undecidable manual P 141 49.3173 107 -0.39 65
IV.ZCCA.HNN. 2023-04-23T04:02:56.39 0.3 undecidable manual P 286 39.9267 111 0.98 54
IV.MPPT.EHN. 2023-04-23T04:02:55.53 0.3 undecidable manual P 222 44.0226 109 -0.46 64
IV.MTRZ.HHZ. 2023-04-23T04:02:55.72 0.6 undecidable manual S 337 7.2927 159 1.03 37
IV.VISG.HHZ. 2023-04-23T04:02:54.10 0.6 undecidable manual S 197 7.2927 160 -0.59 44
IV.MOCL.EHZ. 2023-04-23T04:02:54.44 0.3 undecidable manual P 219 35.3424 115 -0.31 67
IV.BOSL.HHE. 2023-04-23T04:02:54.84 0.3 undecidable manual P 191 36.2415 114 -0.04 71
IV.VMGN.HHN. 2023-04-23T04:02:54.39 0.3 undecidable manual P 170 33.4443 116 -0.11 71
IV.LMD.HHE. 2023-04-23T04:02:53.13 0.3 undecidable manual P 134 27.5502 122 -0.57 64
IV.FNVD.HHZ. 2023-04-23T04:02:53.44 0.3 undecidable manual P 251 28.4493 121 -0.37 67
IV.IMOL.EHZ. 2023-04-23T04:02:53.58 0.3 undecidable manual P 62 25.3524 125 0.16 71
IV.SEI.HHZ. 2023-04-23T04:02:52.74 0.1 undecidable manual P 200 23.3544 127 -0.43 90
IV.VISG.HHZ. 2023-04-23T04:02:51.14 0.1 undecidable manual P 197 7.2927 160 -0.51 90
IV.MTRZ.HHZ. 2023-04-23T04:02:51.65 0.1 undecidable manual P 337 7.2927 159 0 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.VISG.HHE. ML:1.8 0.00045850000000000003 0.16 AML other m 2023-04-23T04:02:54.46
IV.VISG.HHN. ML:1.7 0.0003285 0.48 AML other m 2023-04-23T04:02:54.40
IV.MTRZ.HHE. ML:2.1 0.000853 0.56 AML other m 2023-04-23T04:02:56.78
IV.MTRZ.HNE. ML:2.0 0.000796 0.56 AML other m 2023-04-23T04:02:56.79
IV.MTRZ.HHN. ML:2.1 0.0008755 0.2 AML other m 2023-04-23T04:02:57.20
IV.MTRZ.HNN. ML:2.1 0.0008314999999999999 0.22 AML other m 2023-04-23T04:02:57.21
IV.SEI.HHN. ML:1.8 0.0002765 0.18 AML other m 2023-04-23T04:02:57.66
IV.SEI.HHE. ML:1.4 0.000131 0.44 AML other m 2023-04-23T04:02:57.77
IV.FNVD.HHE. ML:1.3 0.00007494999999999999 0.28 AML other m 2023-04-23T04:02:59.31
IV.FNVD.HHN. ML:1.4 0.00010449999999999999 1.5 AML other m 2023-04-23T04:02:59.03
IV.SFI.EHN. ML:1.0 0.00002435 1.16 AML other m 2023-04-23T04:03:05.16
IV.SFI.EHE. ML:1.2 0.0000422 1.14 AML other m 2023-04-23T04:03:06.01
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