Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.0 on date 23-02-2021 and time 10:20:34 (UTC) in region 2 km E Vicchio (FI)

A magnitude ML 1.0 earthquake occured in region: 2 km E Vicchio (FI), on

  • 23-02-2021 10:20:34 (UTC)
  • 23-02-2021 11:20:34 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.9270, 11.4930 at 9 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
Vicchio FI 2 8044 8044
Dicomano FI 5 5515 13559
Borgo San Lorenzo FI 9 18211 31770
Londa FI 10 1840 33610
San Godenzo FI 10 1167 34777
Rufina FI 11 7346 42123
Scarperia e San Piero FI 14 12217 54340
Vaglia FI 17 5073 59413
Pontassieve FI 17 20603 80016
Pelago FI 17 7660 87676
Marradi FI 19 3139 90815

Municipalities with at least 50000 inhabitants

An earthquake occurred to
26 Km NE of Firenze (382808 inhabitants)
31 Km NE of Scandicci (50609 inhabitants)
32 Km E of Prato (191150 inhabitants)
46 Km E of Pistoia (90315 inhabitants)
51 Km SW of Faenza (58541 inhabitants)
51 Km SW of Imola (69797 inhabitants)
55 Km SW of Forlì (117913 inhabitants)
60 Km NW of Arezzo (99543 inhabitants)
64 Km S of Bologna (386663 inhabitants)
64 Km W of Cesena (96758 inhabitants)
69 Km N of Siena (53903 inhabitants)
79 Km SW of Ravenna (159116 inhabitants)
80 Km E of Lucca (89046 inhabitants)
87 Km W of Rimini (147750 inhabitants)
91 Km E of Pisa (89158 inhabitants)
92 Km SE of Modena (184973 inhabitants)
100 Km E of Viareggio (62467 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 1.0 2021-02-23
10:20:34		 43.9272 11.4932 9 2021-02-23
10:25:21		 Sala Sismica INGV-Roma 87407491
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-02-23 10:20:34 ± 0.17
Latitude 43.9272 ± 0.0090
Longitude 11.4932 ± 0.0100
Depth (km) 9 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 87407491

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 882
Semi-minor axis of confidence ellipse (meter) 676
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 204
Circular confidence region, given by single value of horizontal uncertainty (meter) 880.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 117
Number of associated phases, regardless of their use for origin computation 16
Number of defining phases 15
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.35
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.26530
Number of stations at which the event was observed 9
Number of stations from which data was used for origin computation 8
Magnitude information

ML:1.0

Field Value
Value 1.0
Uncertainty 0.4
Num. used stations 10
Type of magnitude ML
Reference to an origin 87407491
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-02-23 10:25:21
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.ZCCA.HHZ. 2021-02-23T10:20:46.30 3.0 undecidable manual P -0.08 0
IV.VISG.HHZ. 2021-02-23T10:20:46.29 0.6 undecidable manual S 351 29.4483 107 0.87 38
IV.MOCL.EHZ. 2021-02-23T10:20:45.14 0.3 undecidable manual S 289 26.3514 109 0.72 61
IV.LMD.HHZ. 2021-02-23T10:20:43.31 0.6 undecidable manual S 46 23.8539 111 -0.3 46
IV.SEI.HHZ. 2021-02-23T10:20:41.91 0.6 undecidable manual S 323 17.7711 117 0.26 48
IV.VISG.HHZ. 2021-02-23T10:20:40.81 0.1 undecidable manual P 351 29.4483 107 -0.09 96
IV.SFI.HNZ. 2021-02-23T10:20:40.61 0.1 undecidable manual P 95 28.3494 108 -0.1 96
IV.RINC.HHZ. 2021-02-23T10:20:40.18 0.3 undecidable manual S 116 10.1787 132 0.7 64
IV.MOCL.EHZ. 2021-02-23T10:20:39.83 0.1 undecidable manual P 289 26.3514 109 -0.5 89
IV.RONT.HHZ. 2021-02-23T10:20:39.02 0.6 undecidable manual S 327 8.7801 136 -0.12 49
IV.RUFI.EHZ. 2021-02-23T10:20:39.59 0.6 undecidable manual S 172 9.9789 133 0.16 49
IV.LMD.HHZ. 2021-02-23T10:20:39.93 0.6 positive manual P 46 23.8539 111 0.08 49
IV.SEI.HHZ. 2021-02-23T10:20:38.59 0.1 positive manual P 323 17.7711 117 -0.14 97
IV.RINC.HHZ. 2021-02-23T10:20:37.42 0.1 positive manual P 116 10.1787 132 -0.05 100
IV.RONT.HHZ. 2021-02-23T10:20:37.06 0.1 positive manual P 327 8.7801 136 -0.22 96
IV.RUFI.EHZ. 2021-02-23T10:20:37.23 0.1 positive manual P 172 9.9789 133 -0.21 97
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.RONT.HHE. ML:1.7 0.0007210000000000001 1.26 AML other m 2021-02-23T10:20:40.02
IV.RONT.HHN. ML:1.7 0.000748 0.28 AML other m 2021-02-23T10:20:40.10
IV.RINC.HHE. ML:1.0 0.00012235 1.68 AML other m 2021-02-23T10:20:41.89
IV.SEI.HHE. ML:1.2 0.00014600000000000003 1.16 AML other m 2021-02-23T10:20:43.26
IV.RINC.HHN. ML:0.8 0.00007325 0.54 AML other m 2021-02-23T10:20:43.47
IV.SEI.HHN. ML:1.4 0.000222 1.58 AML other m 2021-02-23T10:20:44.91
IV.RUFI.EHE. ML:0.6 0.000053573885000000005 0.32 AML other m 2021-02-23T10:20:43.35
IV.RUFI.EHN. ML:0.8 0.000079374005 0.32 AML other m 2021-02-23T10:20:40.61
IV.LMD.HHE. ML:0.8 0.000033325805 0.1408 AML other m 2021-02-23T10:20:44.75
IV.LMD.HHN. ML:0.8 0.00003411295 0.2368 AML other m 2021-02-23T10:20:44.45
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