Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.6 on date 30-10-2021 and time 00:50:56 (UTC) in region 7 km W Castel del Rio (BO)

A magnitude ML 1.6 earthquake occured in region: 7 km W Castel del Rio (BO), on

  • 30-10-2021 00:50:56 (UTC)
  • 30-10-2021 02:50:56 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.2140, 11.4160 at 19 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 7 1246 1246
Monghidoro BO 8 3749 4995
Loiano BO 10 4294 9289
Firenzuola FI 11 4726 14015
Fontanelice BO 12 1943 15958
Monterenzio BO 13 6035 21993
Monzuno BO 14 6328 28321
San Benedetto Val di Sambro BO 15 4315 32636
Palazzuolo sul Senio FI 15 1154 33790
Borgo Tossignano BO 16 3288 37078
Casola Valsenio RA 17 2617 39695
Casalfiumanese BO 19 3438 43133
Pianoro BO 20 17460 60593

Municipalities with at least 50000 inhabitants

An earthquake occurred to
29 Km SW of Imola (69797 inhabitants)
32 Km S of Bologna (386663 inhabitants)
38 Km W of Faenza (58541 inhabitants)
45 Km NE of Prato (191150 inhabitants)
50 Km W of Forlì (117913 inhabitants)
51 Km NE of Pistoia (90315 inhabitants)
51 Km N of Firenze (382808 inhabitants)
54 Km NE of Scandicci (50609 inhabitants)
62 Km SE of Modena (184973 inhabitants)
66 Km W of Ravenna (159116 inhabitants)
67 Km W of Cesena (96758 inhabitants)
71 Km S of Ferrara (133155 inhabitants)
76 Km SE of Carpi (70699 inhabitants)
82 Km SE of Reggio nell'Emilia (171345 inhabitants)
84 Km E of Lucca (89046 inhabitants)
91 Km NW of Arezzo (99543 inhabitants)
93 Km W of Rimini (147750 inhabitants)
98 Km NE of Pisa (89158 inhabitants)
100 Km N of Siena (53903 inhabitants)
100 Km SW 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 1.6 2021-10-30
00:50:56		 44.214 11.416 19 2022-03-30
13:04:15		 Bollettino Sismico Italiano INGV 97341091
Reviewed
Rev100 		ML 1.7 2021-10-30
00:50:55		 44.2407 11.4232 24 2021-10-30
00:57:33		 Sala Sismica INGV-Roma 97075301
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-30 00:50:56 ± 0.22
Latitude 44.2140 ± 0.0108
Longitude 11.4160 ± 0.0138
Depth (km) 19 ± 3 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 97341091

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1178
Semi-minor axis of confidence ellipse (meter) 694
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 186
Circular confidence region, given by single value of horizontal uncertainty (meter) 1180.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 70
Number of associated phases, regardless of their use for origin computation 24
Number of defining phases 24
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.47
Epicentral distance of station closest to the epicenter (degree) 0.09893
Epicentral distance of station farthest from the epicenter (degree) 0.70867
Number of stations at which the event was observed 13
Number of stations from which data was used for origin computation 13
Magnitudes information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.3
Num. used stations 10
Type of magnitude ML
Reference to an origin 97341091
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2022-01-03 08:08:05

ML:1.7

Field Value
Value 1.7
Uncertainty 0.3
Num. used stations 12
Type of magnitude ML
Reference to an origin 97075301
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-30 00:57:33
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CRE.HHZ. 2021-10-30T00:51:19.46 1.0 undecidable manual S 147 78.6657 97 -0.64 20
IV.CRMI.HHZ. 2021-10-30T00:51:15.59 0.6 undecidable manual S 217 57.9975 100 0.94 38
IV.ASQU.HHZ. 2021-10-30T00:51:14.78 0.3 undecidable manual S 147 55.0005 101 0.91 56
IV.SFI.EHZ. 2021-10-30T00:51:12.60 0.3 undecidable manual S 135 48.5181 103 0.43 68
IV.RUFI.EHZ. 2021-10-30T00:51:11.03 0.3 undecidable manual S 170 42.3243 105 0.46 69
IV.ZCCA.HNE. 2021-10-30T00:51:11.06 1.0 undecidable manual S 294 38.0286 107 1.6 14
IV.CRE.HHZ. 2021-10-30T00:51:10.17 0.1 undecidable manual P 147 78.6657 97 0.04 94
IV.IMOL.HNE. 2021-10-30T00:51:09.04 0.3 undecidable manual S 58 30.5472 113 1.46 42
IV.BDI.HNE. 2021-10-30T00:51:08.92 0.3 undecidable manual P 256 67.377 98 0.5 66
IV.BRIS.HHZ. 2021-10-30T00:51:07.07 0.3 undecidable manual S 87 27.8499 115 0.14 75
IV.LMD.HHE. 2021-10-30T00:51:06.70 0.6 undecidable manual S 123 27.6501 115 -0.18 51
IV.CRMI.HHZ. 2021-10-30T00:51:06.96 0.3 undecidable manual P 217 57.9975 100 -0.02 73
IV.ASQU.HHZ. 2021-10-30T00:51:06.35 0.1 undecidable manual P 147 55.0005 101 -0.18 96
GU.POPM.HHN. 2021-10-30T00:51:06.40 0.3 undecidable manual P 251 55.6998 101 -0.24 70
IV.SFI.EHZ. 2021-10-30T00:51:05.14 0.1 undecidable manual P 135 48.5181 103 -0.41 93
IV.FNVD.HHE. 2021-10-30T00:51:05.58 0.6 undecidable manual S 258 23.8539 120 -0.4 48
IV.ZCCA.HNE. 2021-10-30T00:51:04.72 0.1 undecidable manual P 294 38.0286 107 0.73 85
IV.RUFI.EHZ. 2021-10-30T00:51:04.38 0.1 undecidable manual P 170 42.3243 105 -0.25 96
IV.MTRZ.HHZ. 2021-10-30T00:51:04.16 1.0 undecidable manual S 4 10.9779 145 0.74 21
IV.IMOL.HNE. 2021-10-30T00:51:02.58 0.3 undecidable manual P 58 30.5472 113 -0.32 74
IV.LMD.HHE. 2021-10-30T00:51:02.17 0.3 undecidable manual P 123 27.6501 115 -0.33 74
IV.FNVD.HHE. 2021-10-30T00:51:01.15 0.1 undecidable manual P 258 23.8539 120 -0.83 82
IV.BRIS.HHZ. 2021-10-30T00:51:01.77 0.1 undecidable manual P 87 27.8499 115 -0.76 87
IV.MTRZ.HHZ. 2021-10-30T00:51:00.12 0.1 undecidable manual P 4 10.9779 145 -0.38 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MTRZ.HNE. ML:1.8 0.00046499999999999997 0.62 AML other m 2021-10-30T00:51:04.85
IV.MTRZ.HHE. ML:1.8 0.00048150000000000005 0.62 AML other m 2021-10-30T00:51:04.54
IV.MTRZ.HHN. ML:1.7 0.0003835 1.04 AML other m 2021-10-30T00:51:05.42
IV.MTRZ.HNN. ML:1.7 0.00041049999999999995 0.74 AML other m 2021-10-30T00:51:07.06
IV.BRIS.HHN. ML:1.9 0.000358 0.22 AML other m 2021-10-30T00:51:07.58
IV.BRIS.HHE. ML:1.9 0.000372 0.36 AML other m 2021-10-30T00:51:07.53
IV.SFI.EHN. ML:1.1 0.00003695 1.52 AML other m 2021-10-30T00:51:12.93
IV.SFI.EHE. ML:1.1 0.0000307 0.18 AML other m 2021-10-30T00:51:14.13
IV.ASQU.HHN. ML:1.1 0.000022800000000000002 1.08 AML other m 2021-10-30T00:51:15.85
IV.ASQU.HHE. ML:1.2 0.000032850000000000006 0.68 AML other m 2021-10-30T00:51:17.64
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