Earthquake with magnitude of ML 1.8 on date 08-12-2023 and time 04:33:15 (UTC) in region 3 km SE Casola Valsenio (RA)

A magnitude ML 1.8 earthquake occured in region: 3 km SE Casola Valsenio (RA), on

  • 08-12-2023 04:33:15 (UTC)
  • 08-12-2023 05:33:15 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 44.2080, 11.6600 at 27 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.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Casola Valsenio RA 3 2617 2617
Brisighella RA 9 7639 10256
Riolo Terme RA 9 5720 15976
Borgo Tossignano BO 10 3288 19264
Fontanelice BO 10 1943 21207
Casalfiumanese BO 11 3438 24645
Modigliana FC 12 4560 29205
Castel del Rio BO 12 1246 30451
Palazzuolo sul Senio FI 14 1154 31605
Marradi FI 15 3139 34744
Tredozio FC 16 1212 35956
Castel Bolognese RA 17 9554 45510
Imola BO 17 69797 115307
Dozza BO 17 6652 121959
Faenza RA 20 58541 180500

Municipalities with at least 50000 inhabitants

An earthquake occurred to
17 Km S of Imola (69797 inhabitants)
20 Km W of Faenza (58541 inhabitants)
30 Km W of Forlì (117913 inhabitants)
41 Km SE of Bologna (386663 inhabitants)
47 Km W of Cesena (96758 inhabitants)
49 Km W of Ravenna (159116 inhabitants)
58 Km NE of Prato (191150 inhabitants)
58 Km NE of Firenze (382808 inhabitants)
63 Km NE of Scandicci (50609 inhabitants)
67 Km E of Pistoia (90315 inhabitants)
70 Km S of Ferrara (133155 inhabitants)
74 Km W of Rimini (147750 inhabitants)
76 Km SE of Modena (184973 inhabitants)
84 Km N of Arezzo (99543 inhabitants)
89 Km SE of Carpi (70699 inhabitants)
97 Km S of Rovigo (51867 inhabitants)
98 Km SE 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 1.8 2023-12-08
04:33:15
44.2078 11.6605 27 2023-12-08
04:44:45
Sala Sismica INGV-Roma 123887231
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-12-08 04:33:15 ± 0.32
Latitude 44.2078 ± 0.0117
Longitude 11.6605 ± 0.0151
Depth (km) 27 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 123887231

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1148
Semi-minor axis of confidence ellipse (meter) 1007
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 205
Circular confidence region, given by single value of horizontal uncertainty (meter) 1150.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 174
Number of associated phases, regardless of their use for origin computation 19
Number of defining phases 17
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.34
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.63942
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:1.8

Field Value
Value 1.8
Uncertainty 0.3
Num. used stations 13
Type of magnitude ML
Reference to an origin 123887231
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-12-08 04:44:45
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.PII.HHZ. 2023-12-08T04:33:32.66 3.0 negative manual P -0.06 0
IV.SFI.EHZ. 2023-12-08T04:33:29.64 0.6 undecidable manual S 156 36.741 120 0.69 42
IV.BOSL.HHZ. 2023-12-08T04:33:29.58 0.3 undecidable manual S 217 38.2284 119 0.28 69
IV.CRE.HHZ. 2023-12-08T04:33:28.25 0.6 negative manual P 160 69.375 105 0.32 44
IV.CRMI.HHZ. 2023-12-08T04:33:28.35 0.6 negative manual P 230 70.9734 105 0.18 44
IV.ZCCA.HNZ. 2023-12-08T04:33:27.17 3.0 undecidable manual P 0.65 0
IV.VMGN.HHZ. 2023-12-08T04:33:27.46 0.3 undecidable manual S 200 29.8479 127 0.04 74
IV.MTRZ.HHZ. 2023-12-08T04:33:26.62 0.3 undecidable manual S 302 22.0668 136 0.77 60
IV.LMD.HHZ. 2023-12-08T04:33:24.58 0.3 undecidable manual S 166 14.9739 148 -0.09 75
IV.VISG.HHZ. 2023-12-08T04:33:24.46 0.3 undecidable manual S 263 18.0708 142 -0.7 65
IT.MOG.HNZ. 2023-12-08T04:33:24.22 0.6 undecidable manual S 116 9.4794 159 0.22 50
IV.SFI.EHZ. 2023-12-08T04:33:23.18 0.3 undecidable manual P 156 36.741 120 -0.08 73
IV.BOSL.HHZ. 2023-12-08T04:33:23.40 0.1 undecidable manual P 217 38.2284 119 -0.06 98
IV.FNVD.HHZ. 2023-12-08T04:33:23.84 0.6 undecidable manual P 264 43.0236 116 -0.27 47
IV.VMGN.HHZ. 2023-12-08T04:33:22.37 0.1 undecidable manual P 200 29.8479 127 -0.01 100
IV.MTRZ.HHZ. 2023-12-08T04:33:22.10 0.6 negative manual P 302 22.0668 136 0.63 43
IT.MOG.HNZ. 2023-12-08T04:33:20.35 0.3 undecidable manual P 116 9.4794 159 -0.06 77
IV.LMD.HHZ. 2023-12-08T04:33:20.46 0.1 undecidable manual P 166 14.9739 148 -0.33 96
IV.VISG.HHZ. 2023-12-08T04:33:20.51 0.1 undecidable manual P 263 18.0708 142 -0.56 91
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.LMD.HHE. ML:1.9 0.000404 1.34 AML other m 2023-12-08T04:33:24.09
IV.LMD.HHN. ML:1.8 0.00034599999999999995 0.16 AML other m 2023-12-08T04:33:24.79
IV.VISG.HHN. ML:2.0 0.000507 0.12 AML other m 2023-12-08T04:33:24.91
IV.VISG.HHE. ML:1.8 0.000332 0.44 AML other m 2023-12-08T04:33:24.76
IV.VMGN.HHE. ML:1.7 0.00017350000000000002 1.34 AML other m 2023-12-08T04:33:28.96
IV.MTRZ.HHE. ML:1.9 0.000371 0.6 AML other m 2023-12-08T04:33:28.07
IV.MTRZ.HNE. ML:2.0 0.0004615 0.6 AML other m 2023-12-08T04:33:28.07
IV.VMGN.HHN. ML:1.5 0.000118 0.42 AML other m 2023-12-08T04:33:29.22
IV.MTRZ.HNN. ML:1.9 0.00035099999999999997 1.72 AML other m 2023-12-08T04:33:29.88
IV.MTRZ.HHN. ML:1.9 0.0003585 1.72 AML other m 2023-12-08T04:33:29.88
IV.BOSL.HHE. ML:1.1 0.000039099999999999995 1.58 AML other m 2023-12-08T04:33:30.81
IV.BOSL.HHN. ML:1.1 0.0000362 0.86 AML other m 2023-12-08T04:33:30.88
IV.CRE.HHE. ML:1.3 0.000029984095 0.3616 AML other m 2023-12-08T04:33:40.73
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