Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.7 on date 28-01-2024 and time 04:54:55 (Italy) in region 3 km W Riolo Terme (RA)

A magnitude ML 1.7 earthquake occured in region: 3 km W Riolo Terme (RA), on

  • 28-01-2024 03:54:55 (UTC)
  • 28-01-2024 04:54:55 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 44.2770, 11.6860 at 26 km depth.

The earthquake was located by: Sala Sismica INGV-Roma.

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
Riolo Terme RA 3 5720 5720
Casalfiumanese BO 6 3438 9158
Borgo Tossignano BO 8 3288 12446
Casola Valsenio RA 8 2617 15063
Imola BO 9 69797 84860
Brisighella RA 9 7639 92499
Fontanelice BO 10 1943 94442
Castel Bolognese RA 10 9554 103996
Dozza BO 10 6652 110648
Castel San Pietro Terme BO 16 20811 131459
Faenza RA 16 58541 190000
Modigliana FC 16 4560 194560
Solarolo RA 16 4488 199048
Castel del Rio BO 16 1246 200294
Bagnara di Romagna RA 17 2429 202723
Mordano BO 17 4760 207483
Castel Guelfo di Bologna BO 17 4455 211938

Municipalities with at least 50000 inhabitants

An earthquake occurred to
9 Km S of Imola (69797 inhabitants)
16 Km W of Faenza (58541 inhabitants)
29 Km W of Forlì (117913 inhabitants)
37 Km SE of Bologna (386663 inhabitants)
44 Km W of Ravenna (159116 inhabitants)
47 Km W of Cesena (96758 inhabitants)
63 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)
72 Km NE of Pistoia (90315 inhabitants)
73 Km SE of Modena (184973 inhabitants)
74 Km W of Rimini (147750 inhabitants)
85 Km SE of Carpi (70699 inhabitants)
89 Km S of Rovigo (51867 inhabitants)
91 Km N of Arezzo (99543 inhabitants)
96 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
Reviewed
Rev100 		ML 1.7 2024-01-28
03:54:55		 44.2767 11.6857 26 2024-01-28
04:11:28		 Sala Sismica INGV-Roma 124899831
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2024-01-28 03:54:55 ± 0.28
Latitude 44.2767 ± 0.0099
Longitude 11.6857 ± 0.0138
Depth (km) 26 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 124899831

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1086
Semi-minor axis of confidence ellipse (meter) 521
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 311
Circular confidence region, given by single value of horizontal uncertainty (meter) 1090.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 125
Number of associated phases, regardless of their use for origin computation 22
Number of defining phases 17
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) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.45596
Number of stations at which the event was observed 12
Number of stations from which data was used for origin computation 10
Magnitude information

ML:1.7

Field Value
Value 1.7
Uncertainty 0.3
Num. used stations 12
Type of magnitude ML
Reference to an origin 124899831
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2024-01-28 04:11:28
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.PII.HHZ. 2024-01-28T03:55:16.41 3.0 undecidable manual P -0.09 0
IV.RUFI.EHZ. 2024-01-28T03:55:14.12 3.0 undecidable manual S 196 50.616 110 1.46 0
IV.MOCL.EHZ. 2024-01-28T03:55:13.57 3.0 undecidable manual S 233 50.2164 110 1.02 0
IV.BRSN.EHZ. 2024-01-28T03:55:11.72 3.0 undecidable manual S 31.3464 3.69 0
IV.VMGN.HHZ. 2024-01-28T03:55:10.03 0.6 undecidable manual S 199 37.7289 118 0.52 45
IV.SEI.HHZ. 2024-01-28T03:55:09.80 0.6 undecidable manual S 227 35.8419 119 0.74 43
IT.MRR.HGE. 2024-01-28T03:55:06.40 0.1 undecidable manual S 196 24.4533 131 -0.17 94
IV.LMD.HHZ. 2024-01-28T03:55:06.07 0.6 undecidable manual S 176 22.1556 134 -0.04 49
IV.RUFI.EHZ. 2024-01-28T03:55:06.31 1.0 positive manual P 196 50.616 110 0.7 21
IV.MOCL.EHZ. 2024-01-28T03:55:05.97 0.6 undecidable manual P 233 50.2164 110 0.42 44
IV.VISG.HHZ. 2024-01-28T03:55:05.92 0.6 undecidable manual S 244 22.2555 134 -0.2 47
IV.IMOL.EHZ. 2024-01-28T03:55:04.48 0.6 undecidable manual S 26 10.2786 156 0.22 45
IV.BRSN.EHZ. 2024-01-28T03:55:04.27 3.0 undecidable manual P 31.3464 1.33 0
IT.MOG.HNZ. 2024-01-28T03:55:04.75 0.6 undecidable manual S 151 13.4754 149 0.09 48
IV.VMGN.HHZ. 2024-01-28T03:55:04.09 1.0 undecidable manual P 199 37.7289 118 0.3 23
IV.SEI.HHZ. 2024-01-28T03:55:03.55 0.3 negative manual P 227 35.8419 119 0.02 71
IV.MTRZ.HHZ. 2024-01-28T03:55:01.81 0.6 negative manual P 281 21.0678 136 0.1 48
IV.VISG.HHZ. 2024-01-28T03:55:01.26 0.1 undecidable manual P 244 22.2555 134 -0.57 85
IT.MRR.HGE. 2024-01-28T03:55:01.91 0.1 undecidable manual P 196 24.4533 131 -0.18 94
IV.LMD.HHZ. 2024-01-28T03:55:01.75 0.1 undecidable manual P 176 22.1556 134 -0.08 97
IV.IMOL.EHZ. 2024-01-28T03:55:00.64 0.1 negative manual P 26 10.2786 156 -0.12 100
IT.MOG.HNZ. 2024-01-28T03:55:00.97 0.1 undecidable manual P 151 13.4754 149 -0.02 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.IMOL.HNN. ML:2.3 0.0012945 1.78 AML other m 2024-01-28T03:55:04.97
IV.IMOL.HNE. ML:1.9 0.000462 1.56 AML other m 2024-01-28T03:55:05.94
IV.LMD.HHE. ML:1.8 0.0002665 0.28 AML other m 2024-01-28T03:55:06.39
IV.LMD.HHN. ML:1.8 0.000248 0.28 AML other m 2024-01-28T03:55:06.27
IV.VISG.HHN. ML:1.7 0.00019800000000000002 0.24 AML other m 2024-01-28T03:55:06.85
IV.VISG.HHE. ML:1.7 0.00021400000000000002 1.28 AML other m 2024-01-28T03:55:07.01
IV.SEI.HHE. ML:1.9 0.0002665 0.5 AML other m 2024-01-28T03:55:10.59
IV.SEI.HHN. ML:2.1 0.00042249999999999997 0.2 AML other m 2024-01-28T03:55:10.50
IV.VMGN.HHE. ML:1.2 0.000044149999999999996 0.48 AML other m 2024-01-28T03:55:10.62
IV.VMGN.HHN. ML:1.3 0.00005555 0.52 AML other m 2024-01-28T03:55:11.63
IV.RUFI.EHN. ML:1.4 0.00005385 0.74 AML other m 2024-01-28T03:55:14.97
IV.RUFI.EHE. ML:1.0 0.0000234 1.58 AML other m 2024-01-28T03:55:16.15
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