Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.2 on date 11-03-2021 and time 13:51:06 (UTC) in region 1 km NW Marradi (FI)

A magnitude ML 1.2 earthquake occured in region: 1 km NW Marradi (FI), on

  • 11-03-2021 13:51:06 (UTC)
  • 11-03-2021 14:51:06 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 44.0860, 11.6060 at 10 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 11 1212 5505
Portico e San Benedetto FC 16 756 6261
Casola Valsenio RA 16 2617 8878
Castel del Rio BO 16 1246 10124
Modigliana FC 17 4560 14684
San Godenzo FI 18 1167 15851
Premilcuore FC 18 799 16650
Firenzuola FI 18 4726 21376
Rocca San Casciano FC 19 1910 23286
Fontanelice BO 20 1943 25229

Municipalities with at least 50000 inhabitants

An earthquake occurred to
31 Km S of Imola (69797 inhabitants)
32 Km SW of Faenza (58541 inhabitants)
38 Km W of Forlì (117913 inhabitants)
45 Km NE of Firenze (382808 inhabitants)
47 Km E of Prato (191150 inhabitants)
50 Km NE of Scandicci (50609 inhabitants)
50 Km SE of Bologna (386663 inhabitants)
51 Km W of Cesena (96758 inhabitants)
58 Km E of Pistoia (90315 inhabitants)
60 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)
88 Km N of Siena (53903 inhabitants)
92 Km E of Lucca (89046 inhabitants)
96 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 1.2 2021-03-11
13:51:06		 44.0855 11.6058 10 2021-07-12
16:55:02		 Bollettino Sismico Italiano INGV 88254521
Reviewed
Rev100 		ML 1.2 2021-03-11
13:51:06		 44.0908 11.6128 11 2021-03-11
14:07:28		 Sala Sismica INGV-Roma 88002311
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-03-11 13:51:06 ± 0.06
Latitude 44.0855 ± 0.0036
Longitude 11.6058 ± 0.0050
Depth (km) 10 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 88254521

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 341
Semi-minor axis of confidence ellipse (meter) 200
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 256
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) 70
Number of associated phases, regardless of their use for origin computation 38
Number of defining phases 19
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.2
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.31746
Number of stations at which the event was observed 29
Number of stations from which data was used for origin computation 10
Magnitudes information

ML:1.2

Field Value
Value 1.2
Uncertainty 0.2
Num. used stations 6
Type of magnitude ML
Reference to an origin 88254521
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-03-18 12:01:04

ML:1.2

Field Value
Value 1.2
Uncertainty 0.2
Num. used stations 12
Type of magnitude ML
Reference to an origin 88002311
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-03-11 14:07:28
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.VARE.HHZ. 2021-03-11T13:52:48.39 3.0 undecidable manual Sg 16.870001 0
IV.ERC.EHZ. 2021-03-11T13:52:27.13 3.0 undecidable manual Pg 9.85 0
IV.CAGR.HHZ. 2021-03-11T13:52:21.91 3.0 undecidable manual Pn -3.41 0
IV.MELA.HHZ. 2021-03-11T13:52:11.10 3.0 undecidable manual Sn -1.02 0
IV.VOBA.EHZ. 2021-03-11T13:52:07.37 3.0 undecidable manual Sn 0.95 0
IV.MDI.HHZ. 2021-03-11T13:51:49.47 3.0 positive manual Pg 9.09 0
IV.MRVN.HHZ. 2021-03-11T13:51:46.00 3.0 undecidable manual Pn -5.26 0
CH.BERNI.HHZ. 2021-03-11T13:51:42.11 3.0 undecidable manual Pn -3.18 0
IV.CADC.EHZ. 2021-03-11T13:51:39.89 3.0 positive manual Pg 5.37 0
IV.CAPR.HNZ. 2021-03-11T13:51:38.78 3.0 undecidable manual Pn 1.17 0
IV.MSSA.HHZ. 2021-03-11T13:51:36.01 3.0 undecidable manual Pg 4.17 0
IV.PTRJ.HHZ. 2021-03-11T13:51:35.33 3.0 undecidable manual Pn -1.94 0
IV.RIBO.EHZ.01 2021-03-11T13:51:34.92 3.0 undecidable manual S -3.82 0
IV.INTR.HHZ. 2021-03-11T13:51:32.22 3.0 undecidable manual Pg 5.86 0
MN.TRI.HHZ. 2021-03-11T13:51:28.35 3.0 negative manual Pn -1.95 0
IV.NDIM.HHZ. 2021-03-11T13:51:23.54 3.0 positive manual Pn -0.19 0
IV.CAVE.HHZ. 2021-03-11T13:51:21.18 3.0 positive manual P -1.62 0
IV.ASQU.HHE. 2021-03-11T13:51:19.51 0.6 undecidable manual S 155 35.2425 50 0.36 45
IV.RUFI.EHE. 2021-03-11T13:51:17.39 0.6 undecidable manual S 196 28.5492 50 0.04 49
IV.SFI.HNN. 2021-03-11T13:51:17.30 0.6 undecidable manual S 136 27.75 109 0.17 48
IV.RINC.HHZ. 2021-03-11T13:51:15.44 0.3 undecidable manual S 180 22.0668 113 0.16 73
IV.RONT.HHN. 2021-03-11T13:51:14.13 0.6 undecidable manual S 234 17.1717 119 0.38 47
IV.SEI.HHZ. 2021-03-11T13:51:14.81 0.3 undecidable manual S 260 19.9689 115 0.18 73
IV.BRIS.HHZ. 2021-03-11T13:51:14.92 0.3 undecidable manual S 40 20.0688 115 0.28 71
IV.MTRZ.HNN. 2021-03-11T13:51:13.14 0.1 undecidable manual P 330 29.0487 50 0.11 97
IV.ASQU.HHE. 2021-03-11T13:51:13.76 0.1 undecidable manual P 155 35.2425 50 -0.23 93
IV.VISG.HHZ. 2021-03-11T13:51:13.95 0.6 undecidable manual S 310 17.871 118 -0.01 50
IV.CESX.HHZ. 2021-03-11T13:51:12.55 3.0 positive manual P -1.76 0
IV.RUFI.EHE. 2021-03-11T13:51:12.78 0.3 undecidable manual P 196 28.5492 50 -0.17 72
IV.SFI.HNN. 2021-03-11T13:51:12.69 0.1 undecidable manual P 136 27.75 109 -0.14 96
IV.RINC.HHZ. 2021-03-11T13:51:11.76 0.1 undecidable manual P 180 22.0668 113 0 100
IV.SEI.HHZ. 2021-03-11T13:51:11.15 0.1 positive manual P 260 19.9689 115 -0.23 96
IV.LMD.HHZ. 2021-03-11T13:51:11.08 0.3 undecidable manual S 96 8.1807 139 -0.21 74
IV.BRIS.HHZ. 2021-03-11T13:51:11.67 0.3 undecidable manual P 40 20.0688 115 0.28 71
IV.GAVE.EHZ. 2021-03-11T13:51:11.16 3.0 positive manual Pn -2.04 0
IV.RONT.HHN. 2021-03-11T13:51:10.88 0.3 undecidable manual P 234 17.1717 119 0.01 76
IV.VISG.HHZ. 2021-03-11T13:51:10.66 0.3 undecidable manual P 310 17.871 118 -0.33 71
IV.LMD.HHZ. 2021-03-11T13:51:09.17 0.6 undecidable manual P 96 8.1807 139 -0.28 48
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.LMD.HHE. ML:1.3 0.000296 0.4 AML other m 2021-03-11T13:51:12.59
IV.LMD.HHN. ML:1.2 0.000209 0.44 AML other m 2021-03-11T13:51:12.94
IV.VISG.HHE. ML:1.1 0.00010235 0.18 AML other m 2021-03-11T13:51:15.03
IV.SEI.HHE. ML:1.3 0.00015 0.5 AML other m 2021-03-11T13:51:15.30
IV.VISG.HHN. ML:1.1 0.0001049 0.34 AML other m 2021-03-11T13:51:15.32
IV.SEI.HHN. ML:1.5 0.0002285 0.52 AML other m 2021-03-11T13:51:15.35
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