Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.5 on date 28-01-2021 and time 13:42:50 (Italy) in region 2 km S Sesto Fiorentino (FI)

A magnitude ML 1.5 earthquake occured in region: 2 km S Sesto Fiorentino (FI), on

  • 28-01-2021 12:42:50 (UTC)
  • 28-01-2021 13:42:50 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.8150, 11.2020 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 5 46166 95124
Calenzano FI 6 17489 112613
Scandicci FI 6 50609 163222
Firenze FI 7 382808 546030
Fiesole FI 8 13969 559999
Signa FI 9 19179 579178
Lastra a Signa FI 9 20156 599334
Prato PO 11 191150 790484
Poggio a Caiano PO 12 10007 800491
Bagno a Ripoli FI 12 25611 826102
Vaglia FI 12 5073 831175
Carmignano PO 15 14450 845625
Impruneta FI 15 14615 860240
Montelupo Fiorentino FI 17 14098 874338
San Casciano in Val di Pesa FI 18 17062 891400
Quarrata PT 18 26190 917590
Montemurlo PO 18 18456 936046
Vaiano PO 18 9895 945941
Agliana PT 19 17525 963466
Scarperia e San Piero FI 19 12217 975683
Pontassieve FI 20 20603 996286
Montale PT 20 10737 1007023
Capraia e Limite FI 20 7670 1014693

Municipalities with at least 50000 inhabitants

An earthquake occurred to
6 Km N of Scandicci (50609 inhabitants)
7 Km NW of Firenze (382808 inhabitants)
11 Km SE of Prato (191150 inhabitants)
26 Km SE of Pistoia (90315 inhabitants)
56 Km N of Siena (53903 inhabitants)
56 Km E of Lucca (89046 inhabitants)
65 Km E of Pisa (89158 inhabitants)
67 Km NW of Arezzo (99543 inhabitants)
73 Km SW of Imola (69797 inhabitants)
76 Km SW of Faenza (58541 inhabitants)
77 Km E of Viareggio (62467 inhabitants)
77 Km S of Bologna (386663 inhabitants)
77 Km E of Livorno (159219 inhabitants)
81 Km SW of Forlì (117913 inhabitants)
88 Km E of Massa (69479 inhabitants)
91 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 1.5 2021-01-28
12:42:50		 43.8148 11.2018 8 2021-07-12
16:54:58		 Bollettino Sismico Italiano INGV 87000001
Reviewed
Rev100 		ML 1.8 2021-01-28
12:42:49		 43.809 11.1787 9 2021-01-28
12:48:02		 Sala Sismica INGV-Roma 86655051
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-01-28 12:42:50 ± 0.07
Latitude 43.8148 ± 0.0045
Longitude 11.2018 ± 0.0050
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 87000001

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 450
Semi-minor axis of confidence ellipse (meter) 335
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 30
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 32
Number of defining phases 30
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.24
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.57557
Number of stations at which the event was observed 18
Number of stations from which data was used for origin computation 16
Magnitudes information

ML:1.8

Field Value
Value 1.8
Uncertainty 0.4
Num. used stations 20
Type of magnitude ML
Reference to an origin 86655051
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-01-28 12:48:02

ML:1.5

Field Value
Value 1.5
Uncertainty 0.3
Num. used stations 24
Type of magnitude ML
Reference to an origin 87000001
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-03-15 15:18:05
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.NDIM.HHZ. 2021-01-28T12:43:26.42 3.0 undecidable manual S 1.92 0
IV.SBPO.HNZ. 2021-01-28T12:43:10.49 3.0 negative manual P -0.11 0
IV.PII.HHZ. 2021-01-28T12:43:08.17 0.6 undecidable manual S 259 55.2003 50 0.11 45
IV.SFI.EHZ. 2021-01-28T12:43:07.43 0.6 undecidable manual S 79 52.6029 50 0.07 46
IV.LMD.HHZ. 2021-01-28T12:43:06.73 0.6 undecidable manual S 54 49.8168 50 0.12 46
IV.ASQU.HHZ. 2021-01-28T12:43:05.72 0.6 undecidable manual S 92 47.1195 50 -0.17 45
GU.POPM.HHZ. 2021-01-28T12:43:04.57 0.6 undecidable manual S 306 43.7229 50 -0.44 43
IV.CSNT.HHZ. 2021-01-28T12:43:03.30 0.6 undecidable manual S 169 38.5281 50 -0.32 45
IV.CRE.HHZ. 2021-01-28T12:43:02.08 0.3 undecidable manual P 110 63.8916 50 0.2 66
IV.RINC.HHZ. 2021-01-28T12:43:01.73 0.6 undecidable manual S 76 33.3444 104 -0.45 44
GU.MAIM.HHZ. 2021-01-28T12:43:01.44 0.3 undecidable manual P 281 57.7977 50 0.5 62
IV.RONT.HHZ. 2021-01-28T12:43:01.32 0.6 undecidable manual S 43 27.0507 107 1.24 32
IV.SEI.HHZ. 2021-01-28T12:43:00.59 0.6 undecidable manual S 25 29.3484 106 -0.25 46
IV.PII.HHZ. 2021-01-28T12:43:00.65 0.1 undecidable manual P 259 55.2003 50 0.12 90
IV.SFI.EHZ. 2021-01-28T12:43:00.17 0.3 undecidable manual P 79 52.6029 50 0.05 69
IV.ASQU.HHZ. 2021-01-28T12:42:59.23 0.1 undecidable manual P 92 47.1195 50 -0.05 93
IV.LMD.HHZ. 2021-01-28T12:42:59.56 0.1 undecidable manual P 54 49.8168 50 -0.14 91
GU.POPM.HHZ. 2021-01-28T12:42:58.83 0.3 undecidable manual P 306 43.7229 50 0.06 70
IV.RUFI.EHZ. 2021-01-28T12:42:58.96 0.6 undecidable manual S 84 24.753 109 -0.35 45
IV.CSNT.HHZ. 2021-01-28T12:42:57.66 0.6 undecidable manual P 169 38.5281 50 -0.31 45
IV.RINC.HHZ. 2021-01-28T12:42:57.15 0.1 positive manual P 76 33.3444 104 0.01 96
IV.MOCL.EHZ. 2021-01-28T12:42:57.99 0.6 undecidable manual S 355 21.1677 111 -0.14 48
IV.MPPT.EHZ. 2021-01-28T12:42:56.72 0.6 undecidable manual S 331 18.1707 115 -0.46 45
IV.SEI.HHZ. 2021-01-28T12:42:56.44 0.1 undecidable manual P 25 29.3484 106 0.08 95
IV.RONT.HHZ. 2021-01-28T12:42:56.49 0.1 positive manual P 43 27.0507 107 0.56 86
IV.RUFI.EHZ. 2021-01-28T12:42:55.40 0.1 undecidable manual P 84 24.753 109 -0.08 96
IV.MOCL.EHZ. 2021-01-28T12:42:54.64 0.1 positive manual P 355 21.1677 111 -0.16 95
IV.MPPT.EHZ. 2021-01-28T12:42:54.12 0.1 undecidable manual P 331 18.1707 115 -0.13 96
IT.FIE.HGZ. 2021-01-28T12:42:53.83 0.6 undecidable manual S 97 7.4814 138 -0.29 47
IV.FIR.HHZ. 2021-01-28T12:42:53.94 0.3 undecidable manual S 136 6.1938 143 0.1 74
IT.FIE.HGZ. 2021-01-28T12:42:52.52 0.1 positive manual P 97 7.4814 138 0.04 100
IV.FIR.HHZ. 2021-01-28T12:42:52.55 0.3 undecidable manual P 136 6.1938 143 0.23 72
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.FIR.HNE. ML:2.2 0.002705 0.14 AML other m 2021-01-28T12:42:54.10
IV.FIR.HHE. ML:2.2 0.00271 0.14 AML other m 2021-01-28T12:42:54.10
IV.FIR.HNN. ML:1.7 0.0009983315 0.16 AML other m 2021-01-28T12:42:54.06
IV.FIR.HHN. ML:1.7 0.0009830941 0.416 AML other m 2021-01-28T12:42:54.27
IV.MPPT.EHE. ML:1.2 0.00014084585 0.16 AML other m 2021-01-28T12:42:57.09
IV.MPPT.EHN. ML:1.2 0.00012316715 0.4608 AML other m 2021-01-28T12:42:57.01
IV.MOCL.EHE. ML:1.8 0.0004248681 0.1024 AML other m 2021-01-28T12:42:58.42
IV.MOCL.EHN. ML:1.8 0.00046029555 0.1024 AML other m 2021-01-28T12:42:58.64
IV.RUFI.EHE. ML:1.3 0.00011995949 0.2368 AML other m 2021-01-28T12:42:59.20
IV.RUFI.EHN. ML:1.5 0.00017926755 0.736 AML other m 2021-01-28T12:42:59.10
IV.SEI.HHN. ML:2.1 0.0006090668500000001 0.1856 AML other m 2021-01-28T12:43:01.36
IV.SEI.HHE. ML:1.9 0.00044050000000000003 0.16 AML other m 2021-01-28T12:43:01.51
IV.RONT.HHE. ML:2.2 0.0008462591 0.2368 AML other m 2021-01-28T12:43:01.76
IV.RONT.HHN. ML:2.3 0.00108986 0.4032 AML other m 2021-01-28T12:43:01.65
IV.RINC.HHE. ML:1.3 0.000084662275 0.3008 AML other m 2021-01-28T12:43:02.21
IV.RINC.HHN. ML:1.5 0.00013636140000000002 0.1984 AML other m 2021-01-28T12:43:03.11
IV.CSNT.HHE. ML:1.2 0.00005802638 0.2816 AML other m 2021-01-28T12:43:03.57
IV.CSNT.HHN. ML:1.3 0.000073330555 0.4992 AML other m 2021-01-28T12:43:04.29
IV.ASQU.HHN. ML:1.2 0.000039238170000000005 0.3584 AML other m 2021-01-28T12:43:06.22
IV.ASQU.HHE. ML:1.2 0.000051648480000000004 0.1984 AML other m 2021-01-28T12:43:06.60
IV.LMD.HHN. ML:1.3 0.00005110792 0.5248 AML other m 2021-01-28T12:43:07.30
IV.LMD.HHE. ML:1.2 0.000040616465000000004 0.1344 AML other m 2021-01-28T12:43:07.14
IV.SFI.EHE. ML:1.2 0.000041299999999999994 0.4 AML other m 2021-01-28T12:43:08.22
IV.SFI.EHN. ML:1.4 0.00007089999999999999 0.2 AML other m 2021-01-28T12:43:08.11
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