Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.4 on date 12-10-2021 and time 16:02:31 (Italy) in region 1 km W Marradi (FI)

A magnitude ML 1.4 earthquake occured in region: 1 km W Marradi (FI), on

  • 12-10-2021 14:02:31 (UTC)
  • 12-10-2021 16:02:31 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.0790, 11.6000 at 7 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
Marradi FI 1 3139 3139
Palazzuolo sul Senio FI 6 1154 4293
Tredozio FC 12 1212 5505
Portico e San Benedetto FC 16 756 6261
Casola Valsenio RA 16 2617 8878
Castel del Rio BO 17 1246 10124
San Godenzo FI 17 1167 11291
Modigliana FC 18 4560 15851
Premilcuore FC 18 799 16650
Firenzuola FI 18 4726 21376
Vicchio FI 19 8044 29420
Rocca San Casciano FC 20 1910 31330

Municipalities with at least 50000 inhabitants

An earthquake occurred to
32 Km SW of Imola (69797 inhabitants)
32 Km SW of Faenza (58541 inhabitants)
39 Km W of Forlì (117913 inhabitants)
44 Km NE of Firenze (382808 inhabitants)
46 Km E of Prato (191150 inhabitants)
49 Km NE of Scandicci (50609 inhabitants)
51 Km SE of Bologna (386663 inhabitants)
52 Km W of Cesena (96758 inhabitants)
57 Km E of Pistoia (90315 inhabitants)
61 Km SW of Ravenna (159116 inhabitants)
72 Km NW of Arezzo (99543 inhabitants)
77 Km W of Rimini (147750 inhabitants)
83 Km SE of Modena (184973 inhabitants)
84 Km S of Ferrara (133155 inhabitants)
87 Km N of Siena (53903 inhabitants)
92 Km E of Lucca (89046 inhabitants)
97 Km SE of Carpi (70699 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 1.4 2021-10-12
14:02:31		 44.0788 11.6005 7 2022-03-30
13:04:35		 Bollettino Sismico Italiano INGV 100715881
Reviewed
Rev100 		ML 1.5 2021-10-12
14:02:31		 44.0783 11.5993 7 2021-10-12
14:14:03		 Sala Sismica INGV-Roma 96475871
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-12 14:02:31 ± 0.06
Latitude 44.0788 ± 0.0036
Longitude 11.6005 ± 0.0038
Depth (km) 7 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 100715881

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 344
Semi-minor axis of confidence ellipse (meter) 265
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 196
Circular confidence region, given by single value of horizontal uncertainty (meter) 340.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 86
Number of associated phases, regardless of their use for origin computation 22
Number of defining phases 22
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.22
Epicentral distance of station closest to the epicenter (degree) 0.07644
Epicentral distance of station farthest from the epicenter (degree) 0.52430
Number of stations at which the event was observed 11
Number of stations from which data was used for origin computation 11
Magnitudes information

ML:1.4

Field Value
Value 1.4
Uncertainty 0.2
Num. used stations 11
Type of magnitude ML
Reference to an origin 100715881
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2022-02-07 16:09:24

ML:1.5

Field Value
Value 1.5
Uncertainty 0.2
Num. used stations 8
Type of magnitude ML
Reference to an origin 96475871
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-12 14:14:03
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CRE.HHZ. 2021-10-12T14:02:50.78 0.3 undecidable manual S 151 58.1973 50 0.4 64
IV.MPPT.EHE. 2021-10-12T14:02:46.01 0.6 undecidable manual S 252 42.8238 50 -0.27 45
IV.FNVD.HHE. 2021-10-12T14:02:45.32 0.3 undecidable manual S 285 39.3273 50 0 72
IV.MOCL.EHE. 2021-10-12T14:02:43.73 0.3 undecidable manual S 256 34.4433 102 -0.02 73
IV.ASQU.HHZ. 2021-10-12T14:02:43.74 0.3 undecidable manual S 154 34.743 102 -0.11 71
IV.CRE.HHZ. 2021-10-12T14:02:42.23 0.1 undecidable manual P 151 58.1973 50 -0.19 90
IV.SFI.EHZ. 2021-10-12T14:02:41.56 0.3 undecidable manual S 134 27.5502 105 0.13 72
IV.RUFI.EHZ. 2021-10-12T14:02:41.74 0.6 undecidable manual S 195 27.6501 105 0.27 47
IV.MPPT.EHE. 2021-10-12T14:02:40.70 0.3 undecidable manual P 252 42.8238 50 0.65 61
IV.FNVD.HHE. 2021-10-12T14:02:39.11 0.1 undecidable manual P 285 39.3273 50 -0.39 89
IV.SEI.HHE. 2021-10-12T14:02:39.08 0.6 undecidable manual S 262 19.4694 110 0.33 47
IV.BRIS.HHZ. 2021-10-12T14:02:39.66 0.6 undecidable manual S 39 20.868 109 0.45 45
IV.MOCL.EHE. 2021-10-12T14:02:38.41 0.3 undecidable manual P 256 34.4433 102 -0.18 70
IV.ASQU.HHZ. 2021-10-12T14:02:38.40 0.1 undecidable manual P 154 34.743 102 -0.25 92
IV.VISG.HHE. 2021-10-12T14:02:38.23 0.6 undecidable manual S 313 17.9709 112 -0.04 50
IV.SFI.EHZ. 2021-10-12T14:02:37.12 0.1 undecidable manual P 134 27.5502 105 -0.12 96
IV.RUFI.EHZ. 2021-10-12T14:02:37.30 0.1 undecidable manual P 195 27.6501 105 0.03 98
IV.BRIS.HHZ. 2021-10-12T14:02:36.04 0.1 positive manual P 39 20.868 109 0.07 98
IV.SEI.HHE. 2021-10-12T14:02:35.82 0.1 undecidable manual P 262 19.4694 110 0.12 97
IV.LMD.HHZ. 2021-10-12T14:02:35.28 0.6 undecidable manual S 91 8.4804 130 -0.14 49
IV.VISG.HHE. 2021-10-12T14:02:35.36 0.1 undecidable manual P 313 17.9709 112 -0.07 99
IV.LMD.HHZ. 2021-10-12T14:02:33.69 0.1 positive manual P 91 8.4804 130 -0.09 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.BRIS.HHN. ML:1.6 0.0003175 0.28 AML other m 2021-10-12T14:02:39.92
IV.SFI.EHE. ML:1.2 0.00008874999999999999 0.16 AML other m 2021-10-12T14:02:42.20
IV.SFI.EHN. ML:1.3 0.0001042 0.6 AML other m 2021-10-12T14:02:42.26
IV.ASQU.HHN. ML:1.6 0.000177 0.24 AML other m 2021-10-12T14:02:44.27
IV.ASQU.HHE. ML:1.4 0.00010985 0.82 AML other m 2021-10-12T14:02:44.53
IV.BRIS.HHE. ML:1.4 0.0002 0.34 AML other m 2021-10-12T14:02:44.96
IV.CRE.HHE. ML:1.4 0.00005595 0.24 AML other m 2021-10-12T14:02:51.28
IV.CRE.HHN. ML:1.6 0.0000955 0.18 AML other m 2021-10-12T14:02:51.57
IV.LMD.HHE. ML:1.0 0.00018728655 0.1216 AML other m 2021-10-12T14:02:37.62
IV.RUFI.EHE. ML:0.9 0.000042997995 0.2752 AML other m 2021-10-12T14:02:42.09
IV.RUFI.EHN. ML:1.1 0.000066593815 0.1856 AML other m 2021-10-12T14:02:42.17
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