Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.6 on date 27-01-2021 and time 00:00:31 (UTC) in region 2 km S Sesto Fiorentino (FI)

A magnitude ML 1.6 earthquake occured in region: 2 km S Sesto Fiorentino (FI), on

  • 27-01-2021 00:00:31 (UTC)
  • 27-01-2021 01:00:31 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.8150, 11.2060 at 8 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
Sesto Fiorentino FI 2 48958 48958
Campi Bisenzio FI 6 46166 95124
Calenzano FI 6 17489 112613
Firenze FI 6 382808 495421
Scandicci FI 7 50609 546030
Fiesole FI 7 13969 559999
Signa FI 9 19179 579178
Lastra a Signa FI 9 20156 599334
Prato PO 11 191150 790484
Bagno a Ripoli FI 12 25611 816095
Vaglia FI 12 5073 821168
Poggio a Caiano PO 12 10007 831175
Impruneta FI 15 14615 845790
Carmignano PO 15 14450 860240
San Casciano in Val di Pesa FI 18 17062 877302
Montelupo Fiorentino FI 18 14098 891400
Montemurlo PO 18 18456 909856
Vaiano PO 18 9895 919751
Quarrata PT 19 26190 945941
Agliana PT 19 17525 963466
Scarperia e San Piero FI 19 12217 975683
Pontassieve FI 19 20603 996286
Montale PT 20 10737 1007023

Municipalities with at least 50000 inhabitants

An earthquake occurred to
6 Km NW of Firenze (382808 inhabitants)
7 Km NE of Scandicci (50609 inhabitants)
11 Km SE of Prato (191150 inhabitants)
27 Km E of Pistoia (90315 inhabitants)
56 Km N of Siena (53903 inhabitants)
57 Km E of Lucca (89046 inhabitants)
66 Km E of Pisa (89158 inhabitants)
67 Km NW of Arezzo (99543 inhabitants)
72 Km SW of Imola (69797 inhabitants)
75 Km SW of Faenza (58541 inhabitants)
76 Km S of Bologna (386663 inhabitants)
77 Km E of Viareggio (62467 inhabitants)
78 Km E of Livorno (159219 inhabitants)
81 Km SW of Forlì (117913 inhabitants)
89 Km E of Massa (69479 inhabitants)
90 Km W of Cesena (96758 inhabitants)
93 Km E of Carrara (63133 inhabitants)
95 Km S of Modena (184973 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 2021-01-27
00:00:31		 43.8152 11.2063 8 2021-07-12
16:54:56		 Bollettino Sismico Italiano INGV 86757611
Reviewed
Rev100 		ML 1.6 2021-01-27
00:00:31		 43.8168 11.2015 8 2021-01-27
00:07:32		 Sala Sismica INGV-Roma 86615811
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-01-27 00:00:31 ± 0.08
Latitude 43.8152 ± 0.0045
Longitude 11.2063 ± 0.0062
Depth (km) 8 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 86757611

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 454
Semi-minor axis of confidence ellipse (meter) 440
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 59
Circular confidence region, given by single value of horizontal uncertainty (meter) 450.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 90
Number of associated phases, regardless of their use for origin computation 23
Number of defining phases 23
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.25
Epicentral distance of station closest to the epicenter (degree) 0.05396
Epicentral distance of station farthest from the epicenter (degree) 0.57287
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 0.2
Num. used stations 8
Type of magnitude ML
Reference to an origin 86757611
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-03-11 11:07:10

ML:1.6

Field Value
Value 1.6
Uncertainty 0.2
Num. used stations 8
Type of magnitude ML
Reference to an origin 86615811
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-01-27 00:07:32
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.SFI.EHZ. 2021-01-27T00:00:49.00 0.3 undecidable manual S 79 52.2033 50 0.2 67
IV.LMD.HHZ. 2021-01-27T00:00:48.20 0.3 undecidable manual S 54 49.4172 50 0.13 69
GU.POPM.HHZ. 2021-01-27T00:00:46.10 0.6 undecidable manual S 306 44.0226 50 -0.53 42
IV.CSNT.HHZ. 2021-01-27T00:00:44.80 0.6 undecidable manual S 170 38.5281 50 -0.36 45
IV.CRE.HHZ. 2021-01-27T00:00:43.57 0.3 undecidable manual P 110 63.5919 50 0.2 66
IV.RINC.HHZ. 2021-01-27T00:00:43.20 0.3 undecidable manual S 76 33.0447 104 -0.4 67
IV.PII.HHZ. 2021-01-27T00:00:42.13 0.1 undecidable manual P 260 55.5999 50 0 93
IV.SEI.HHZ. 2021-01-27T00:00:42.00 0.3 undecidable manual S 25 29.1486 106 -0.31 69
IV.LMD.HHZ. 2021-01-27T00:00:41.14 0.3 undecidable manual P 54 49.4172 50 -0.05 70
IV.SFI.EHZ. 2021-01-27T00:00:41.73 0.1 undecidable manual P 79 52.2033 50 0.12 91
GU.POPM.HHZ. 2021-01-27T00:00:40.79 0.3 undecidable manual P 306 44.0226 50 0.43 65
IV.RUFI.EHZ. 2021-01-27T00:00:40.30 0.6 undecidable manual S 84 24.3534 109 -0.42 45
IV.CSNT.HHZ. 2021-01-27T00:00:39.15 0.1 undecidable manual P 170 38.5281 50 -0.36 89
IV.MOCL.EHZ. 2021-01-27T00:00:39.50 0.1 undecidable manual S 354 21.1677 111 -0.17 96
IV.RONT.HHZ. 2021-01-27T00:00:38.00 0.1 undecidable manual P 42 26.8509 107 0.59 85
IV.RINC.HHZ. 2021-01-27T00:00:38.68 0.1 undecidable manual P 76 33.0447 104 0.07 96
IV.SEI.HHZ. 2021-01-27T00:00:37.97 0.1 undecidable manual P 25 29.1486 106 0.11 96
IV.MOCL.EHZ. 2021-01-27T00:00:36.27 0.1 undecidable manual P 354 21.1677 111 -0.07 98
IV.RUFI.EHZ. 2021-01-27T00:00:36.93 0.1 undecidable manual P 84 24.3534 109 -0.02 98
IV.FIR.HNE. 2021-01-27T00:00:35.50 0.6 undecidable manual S 139 5.994 144 0.17 49
IT.FIE.HGZ. 2021-01-27T00:00:35.30 0.6 undecidable manual S 97 7.0929 139 -0.27 48
IT.FIE.HGZ. 2021-01-27T00:00:34.04 0.1 undecidable manual P 97 7.0929 139 0.07 100
IV.FIR.HNE. 2021-01-27T00:00:34.06 0.1 undecidable manual P 139 5.994 144 0.23 97
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MOCL.EHE. ML:1.4 0.0001785 1.3 AML other m 2021-01-27T00:00:39.31
IV.MOCL.EHN. ML:1.3 0.00015304999999999998 0.24 AML other m 2021-01-27T00:00:40.18
IV.SEI.HHE. ML:1.4 0.0001365 0.16 AML other m 2021-01-27T00:00:43.05
IV.SEI.HHN. ML:1.6 0.00020950000000000002 0.18 AML other m 2021-01-27T00:00:43.25
IV.RONT.HHE. ML:1.9 0.00041999999999999996 0.12 AML other m 2021-01-27T00:00:43.65
IV.RONT.HHN. ML:1.9 0.000489 0.26 AML other m 2021-01-27T00:00:43.60
IV.PII.HHE. ML:1.6 0.00008785 0.28 AML other m 2021-01-27T00:00:53.50
IV.PII.HHN. ML:1.4 0.00006455 0.22 AML other m 2021-01-27T00:00:53.51
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