Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.7 on date 18-04-2023 and time 14:44:27 (Italy) in region 4 km E Casalfiumanese (BO)

A magnitude ML 0.7 earthquake occured in region: 4 km E Casalfiumanese (BO), on

  • 18-04-2023 12:44:27 (UTC)
  • 18-04-2023 14:44:27 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.2850, 11.6640 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
Casalfiumanese BO 4 3438 3438
Riolo Terme RA 5 5720 9158
Borgo Tossignano BO 6 3288 12446
Casola Valsenio RA 8 2617 15063
Imola BO 9 69797 84860
Dozza BO 9 6652 91512
Fontanelice BO 9 1943 93455
Brisighella RA 11 7639 101094
Castel Bolognese RA 11 9554 110648
Castel San Pietro Terme BO 14 20811 131459
Castel del Rio BO 15 1246 132705
Castel Guelfo di Bologna BO 16 4455 137160
Solarolo RA 17 4488 141648
Mordano BO 17 4760 146408
Bagnara di Romagna RA 17 2429 148837
Faenza RA 18 58541 207378
Modigliana FC 18 4560 211938

Municipalities with at least 50000 inhabitants

An earthquake occurred to
9 Km SW of Imola (69797 inhabitants)
18 Km W of Faenza (58541 inhabitants)
31 Km W of Forlì (117913 inhabitants)
35 Km SE of Bologna (386663 inhabitants)
45 Km W of Ravenna (159116 inhabitants)
49 Km W of Cesena (96758 inhabitants)
61 Km S of Ferrara (133155 inhabitants)
64 Km NE of Prato (191150 inhabitants)
66 Km NE of Firenze (382808 inhabitants)
70 Km NE of Scandicci (50609 inhabitants)
71 Km SE of Modena (184973 inhabitants)
71 Km NE of Pistoia (90315 inhabitants)
76 Km W of Rimini (147750 inhabitants)
83 Km SE of Carpi (70699 inhabitants)
88 Km S of Rovigo (51867 inhabitants)
93 Km N of Arezzo (99543 inhabitants)
94 Km E of Reggio nell'Emilia (171345 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 0.7 2023-04-18
12:44:27		 44.2853 11.6645 9 2024-03-01
17:18:20		 Bollettino Sismico Italiano INGV 125128861
Reviewed
Rev100 		ML 0.8 2023-04-18
12:44:26		 44.3098 11.6797 21 2023-04-18
13:40:35		 Sala Sismica INGV-Roma 116490061
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-04-18 12:44:27 ± 0.11
Latitude 44.2853 ± 0.0054
Longitude 11.6645 ± 0.0075
Depth (km) 9 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 125128861

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 733
Semi-minor axis of confidence ellipse (meter) 285
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 223
Circular confidence region, given by single value of horizontal uncertainty (meter) 730.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 82
Number of associated phases, regardless of their use for origin computation 20
Number of defining phases 20
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.27
Epicentral distance of station closest to the epicenter (degree) 0.09533
Epicentral distance of station farthest from the epicenter (degree) 0.75543
Number of stations at which the event was observed 12
Number of stations from which data was used for origin computation 12
Magnitudes information

ML:0.7

Field Value
Value 0.7
Uncertainty 0.2
Num. used stations 10
Type of magnitude ML
Reference to an origin 125128861
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2024-02-08 14:13:14

ML:0.8

Field Value
Value 0.8
Uncertainty 0.2
Num. used stations 8
Type of magnitude ML
Reference to an origin 116490061
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-04-18 13:40:35
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.SFI.EHZ. 2023-04-18T12:44:42.82 0.6 undecidable manual S 161 44.622 50 0.44 46
4P.IT08A.HHZ. 2023-04-18T12:44:42.49 1.0 undecidable manual P 22 83.8494 50 0.31 22
4P.IT09A.HHZ. 2023-04-18T12:44:42.48 0.6 undecidable manual S 337 45.4212 50 -0.09 49
IV.BOSL.HHZ. 2023-04-18T12:44:42.91 0.6 undecidable manual S 211 45.621 50 0.27 47
IV.CPGN.EHZ. 2023-04-18T12:44:41.13 0.6 undecidable manual P 136 74.9694 50 0.31 44
IV.VMGN.HHZ. 2023-04-18T12:44:40.76 0.6 undecidable manual S 196 38.1285 50 0.11 50
IV.BLLA.EHE. 2023-04-18T12:44:39.01 1.0 undecidable manual P 104 65.9895 50 -0.42 22
IV.FERS.HNN. 2023-04-18T12:44:39.46 1.0 undecidable manual P 352 69.2751 50 -0.47 22
IV.LMD.HHZ. 2023-04-18T12:44:36.52 0.3 undecidable manual S 172 23.3544 112 0.19 75
4P.IT09A.HHZ. 2023-04-18T12:44:36.35 1.0 undecidable manual P 337 45.4212 50 0.1 25
IV.VISG.HHZ. 2023-04-18T12:44:35.82 0.6 undecidable manual S 240 21.1677 114 0.17 50
IV.SFI.EHZ. 2023-04-18T12:44:35.96 0.6 undecidable manual P 161 44.622 50 -0.18 48
IV.MTRZ.HHZ. 2023-04-18T12:44:35.24 0.6 undecidable manual S 279 19.2696 116 0.19 50
IV.BOSL.HHZ. 2023-04-18T12:44:35.88 1.0 undecidable manual P 211 45.621 50 -0.41 23
IV.VMGN.HHZ. 2023-04-18T12:44:34.81 0.6 undecidable manual P 196 38.1285 50 -0.34 47
IV.BRIS.HHZ. 2023-04-18T12:44:32.49 0.3 undecidable manual S 130 10.5783 131 -0.02 80
IV.MTRZ.HHZ. 2023-04-18T12:44:32.28 0.1 positive manual P 279 19.2696 116 0.38 97
IV.LMD.HHZ. 2023-04-18T12:44:32.08 0.1 undecidable manual P 172 23.3544 112 -0.57 91
IV.VISG.HHZ. 2023-04-18T12:44:31.73 0.1 undecidable manual P 240 21.1677 114 -0.53 93
IV.BRIS.HHZ. 2023-04-18T12:44:30.74 0.1 undecidable manual P 130 10.5783 131 0.3 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.BRIS.HHE. ML:0.5 0.000038150000000000006 0.4 AML other m 2023-04-18T12:44:34.16
IV.BRIS.HHN. ML:0.5 0.00004225 0.88 AML other m 2023-04-18T12:44:34.38
IV.LMD.HHN. ML:0.7 0.00003275 0.28 AML other m 2023-04-18T12:44:36.75
IV.VISG.HHN. ML:0.8 0.0000448 1.06 AML other m 2023-04-18T12:44:36.29
IV.LMD.HHE. ML:0.9 0.0000537 0.24 AML other m 2023-04-18T12:44:36.71
IV.VISG.HHE. ML:0.8 0.00004635 0.14 AML other m 2023-04-18T12:44:37.20
IV.MTRZ.HHN. ML:0.5 0.000027230995 0.1984 AML other m 2023-04-18T12:44:39.61
IV.MTRZ.HHE. ML:0.6 0.000034812280000000004 0.2432 AML other m 2023-04-18T12:44:37.82
IV.SFI.EHE. ML:0.5 0.0000107714315 0.48 AML other m 2023-04-18T12:44:44.36
IV.SFI.EHN. ML:0.5 0.000009969559 0.2176 AML other m 2023-04-18T12:44:44.44
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