Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.8 on date 21-03-2020 and time 13:08:29 (Italy) in region 3 km NE Castelfiorentino (FI)

A magnitude ML 1.8 earthquake occured in region: 3 km NE Castelfiorentino (FI), on

  • 21-03-2020 12:08:29 (UTC)
  • 21-03-2020 13:08:29 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.6250, 10.9920 at 11 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
Castelfiorentino FI 3 17504 17504
Montespertoli FI 7 13537 31041
Certaldo FI 9 16121 47162
Gambassi Terme FI 10 4870 52032
Montaione FI 10 3700 55732
Empoli FI 11 48109 103841
Montelupo Fiorentino FI 12 14098 117939
San Miniato PI 13 27934 145873
Capraia e Limite FI 13 7670 153543
San Casciano in Val di Pesa FI 16 17062 170605
Tavarnelle Val di Pesa FI 16 7800 178405
Barberino Val d'Elsa FI 17 4386 182791
Cerreto Guidi FI 18 10870 193661
Palaia PI 18 4612 198273
San Gimignano SI 18 7820 206093
Lastra a Signa FI 19 20156 226249
Fucecchio FI 19 23618 249867
Vinci FI 19 14604 264471
Montopoli in Val d'Arno PI 19 11148 275619
Signa FI 20 19179 294798
Santa Croce sull'Arno PI 20 14601 309399

Municipalities with at least 50000 inhabitants

An earthquake occurred to
21 Km SW of Scandicci (50609 inhabitants)
27 Km SW of Firenze (382808 inhabitants)
30 Km S of Prato (191150 inhabitants)
35 Km S of Pistoia (90315 inhabitants)
44 Km NW of Siena (53903 inhabitants)
46 Km SE of Lucca (89046 inhabitants)
49 Km E of Pisa (89158 inhabitants)
56 Km E of Livorno (159219 inhabitants)
65 Km E of Viareggio (62467 inhabitants)
74 Km W of Arezzo (99543 inhabitants)
82 Km SE of Massa (69479 inhabitants)
88 Km SE of Carrara (63133 inhabitants)
97 Km N of Grosseto (82087 inhabitants)
100 Km SW of Imola (69797 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 1.8 2020-03-21
12:08:29		 43.6253 10.9925 11 2020-07-18
21:08:29		 Bollettino Sismico Italiano INGV 77701631
Reviewed
Rev100 		ML 1.9 2020-03-21
12:08:29		 43.6227 10.9862 11 2020-03-21
12:21:28		 Sala Sismica INGV-Roma 77436431
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-03-21 12:08:29 ± 0.15
Latitude 43.6253 ± 0.0045
Longitude 10.9925 ± 0.0062
Depth (km) 11 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 77701631

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 536
Semi-minor axis of confidence ellipse (meter) 170
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 98
Circular confidence region, given by single value of horizontal uncertainty (meter) 540.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 50
Number of associated phases, regardless of their use for origin computation 42
Number of defining phases 42
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) 0.17087
Epicentral distance of station farthest from the epicenter (degree) 1.01444
Number of stations at which the event was observed 25
Number of stations from which data was used for origin computation 25
Magnitudes information

ML:1.9

Field Value
Value 1.9
Uncertainty 0.3
Num. used stations 36
Type of magnitude ML
Reference to an origin 77436431
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-03-21 12:21:28

ML:1.8

Field Value
Value 1.8
Uncertainty 0.3
Num. used stations 40
Type of magnitude ML
Reference to an origin 77701631
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2020-03-30 14:19:26
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
MN.VLC.HHZ. 2020-03-21T12:08:52.30 0.6 undecidable manual S 321 76.5678 50 0.13 45
IV.LMD.HHZ. 2020-03-21T12:08:52.30 0.6 undecidable manual S 48 76.0683 50 0.26 44
Z3.A317A.HHE. 2020-03-21T12:08:48.46 0.6 undecidable manual P 236 112.5984 50 0.45 39
IV.PARC.HHZ. 2020-03-21T12:08:47.12 0.6 undecidable manual P 88 100.122 50 1.04 32
IV.BDI.HHZ. 2020-03-21T12:08:47.20 0.3 undecidable manual S 327 57.9975 50 -0.02 71
IV.RINC.HHZ. 2020-03-21T12:08:47.10 0.6 undecidable manual S 59 57.0984 50 0.11 47
TV.SF04.EHZ. 2020-03-21T12:08:46.88 0.6 undecidable manual P 148 102.9192 50 0.37 41
IV.RONT.HHZ. 2020-03-21T12:08:46.80 0.6 undecidable manual S 41 54.0015 50 0.66 41
IV.SEI.HHZ. 2020-03-21T12:08:46.70 0.6 undecidable manual S 31 55.8996 50 0.04 47
IV.TRIF.CHZ. 2020-03-21T12:08:46.50 0.6 undecidable manual S 187 57.0984 50 -0.48 43
GU.POPM.HHZ. 2020-03-21T12:08:45.70 0.6 undecidable manual S 338 50.2164 50 0.55 43
IV.ARCI.HHZ. 2020-03-21T12:08:45.58 0.6 undecidable manual P 155 94.239 50 0.4 41
IV.MAGO.CHZ. 2020-03-21T12:08:44.50 0.6 undecidable manual S 215 47.4192 50 0.09 48
GU.MAIM.HHZ. 2020-03-21T12:08:44.60 0.6 undecidable manual S 309 51.3153 50 -0.85 38
IV.RIBO.EHE.01 2020-03-21T12:08:44.04 0.3 undecidable manual P 177 75.1692 50 1.8 32
IV.RUFI.EHZ. 2020-03-21T12:08:44.00 0.3 undecidable manual S 60 47.7189 50 -0.47 66
IV.FROS.CHZ. 2020-03-21T12:08:43.80 0.3 undecidable manual S 164 47.9187 50 -0.74 60
IV.CRE.HHE. 2020-03-21T12:08:43.13 0.3 undecidable manual P 90 77.0673 50 0.6 60
MN.VLC.HHZ. 2020-03-21T12:08:42.71 0.3 undecidable manual P 321 76.5678 50 0.26 66
IV.LMD.HHZ. 2020-03-21T12:08:42.73 0.3 undecidable manual P 48 76.0683 50 0.35 64
IV.PII.HHZ. 2020-03-21T12:08:41.40 0.3 undecidable manual S 286 39.0276 50 -0.76 60
GU.CARD.HHZ. 2020-03-21T12:08:40.03 0.3 undecidable manual P 318 60.3951 50 0.07 70
IV.FNVD.HHZ. 2020-03-21T12:08:40.39 0.3 undecidable manual P 10 61.0944 50 0.32 67
IV.SEI.HHZ. 2020-03-21T12:08:39.52 0.3 undecidable manual P 31 55.8996 50 0.25 68
IV.RINC.HHZ. 2020-03-21T12:08:39.55 0.1 undecidable manual P 59 57.0984 50 0.09 94
IV.TRIF.CHZ. 2020-03-21T12:08:39.61 0.3 undecidable manual P 187 57.0984 50 0.15 70
IV.BDI.HHZ. 2020-03-21T12:08:39.63 0.3 undecidable manual P 327 57.9975 50 0.03 71
IV.RONT.HHZ. 2020-03-21T12:08:39.51 0.3 undecidable manual P 41 54.0015 50 0.54 64
IT.FIE.HGN. 2020-03-21T12:08:39.80 0.3 undecidable manual S 50 31.5462 50 -0.35 70
GU.MAIM.HHZ. 2020-03-21T12:08:38.63 0.3 undecidable manual P 309 51.3153 50 0.06 72
IV.CSNT.HHZ. 2020-03-21T12:08:38.80 0.6 undecidable manual S 125 29.2485 50 -0.76 41
IV.FIR.HHZ. 2020-03-21T12:08:38.40 0.3 undecidable manual S 52 26.751 50 -0.49 68
IV.MAGO.CHZ. 2020-03-21T12:08:38.05 0.1 undecidable manual P 215 47.4192 50 0.08 96
GU.POPM.HHZ. 2020-03-21T12:08:38.60 0.3 undecidable manual P 338 50.2164 50 0.2 70
IV.FROS.CHZ. 2020-03-21T12:08:37.92 0.3 undecidable manual P 164 47.9187 50 -0.12 71
IV.RUFI.EHZ. 2020-03-21T12:08:37.87 0.1 undecidable manual P 60 47.7189 50 -0.14 95
IV.PII.HHZ. 2020-03-21T12:08:36.66 0.1 undecidable manual P 286 39.0276 50 -0.01 99
IV.CRMI.HHE. 2020-03-21T12:08:36.10 0.3 undecidable manual S 357 18.9699 119 -0.6 66
IT.FIE.HGN. 2020-03-21T12:08:35.52 0.1 undecidable manual P 50 31.5462 50 0.01 100
IV.FIR.HHZ. 2020-03-21T12:08:34.49 0.1 undecidable manual P 52 26.751 50 -0.3 95
IV.CSNT.HHZ. 2020-03-21T12:08:34.66 0.1 undecidable manual P 125 29.2485 50 -0.51 90
IV.CRMI.HHE. 2020-03-21T12:08:33.28 0.1 undecidable manual P 357 18.9699 119 -0.24 97
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.FIR.HHE. ML:0.0 0.0006674255 0.16 AML other m 2020-03-21T12:08:39.24
IV.CSNT.HHE. ML:0.0 0.00017635606999999998 0.1408 AML other m 2020-03-21T12:08:39.30
IV.FIR.HNN. ML:0.0 0.00050083245 0.1792 AML other m 2020-03-21T12:08:39.48
IV.FIR.HHN. ML:0.0 0.0005465819 0.1856 AML other m 2020-03-21T12:08:39.48
IV.FIR.HNE. ML:0.0 0.00067865055 0.1728 AML other m 2020-03-21T12:08:39.24
IV.PII.HHE. ML:0.0 0.0012731785 0.16 AML other m 2020-03-21T12:08:41.64
IV.PII.HHN. ML:0.0 0.0011157159999999999 0.16 AML other m 2020-03-21T12:08:41.89
IV.CSNT.HHN. ML:0.0 0.00023650765 0.2176 AML other m 2020-03-21T12:08:41.90
IV.FROS.CHN. ML:0.0 0.00041840675 0.3008 AML other m 2020-03-21T12:08:45.21
IV.MAGO.CHN. ML:0.0 0.00016654115 0.1536 AML other m 2020-03-21T12:08:45.07
IV.RUFI.EHN. ML:0.0 0.00016579345 0.1792 AML other m 2020-03-21T12:08:45.12
IV.MAGO.CHE. ML:0.0 0.00014984133 0.128 AML other m 2020-03-21T12:08:45.10
IV.RUFI.EHE. ML:0.0 0.00023624425 0.2368 AML other m 2020-03-21T12:08:45.01
IV.FROS.CHE. ML:0.0 0.0005121090500000001 0.1984 AML other m 2020-03-21T12:08:45.84
GU.POPM.HHE. ML:0.0 0.00034866875 0.1792 AML other m 2020-03-21T12:08:47.64
GU.POPM.HHN. ML:0.0 0.00030263850000000005 0.1984 AML other m 2020-03-21T12:08:47.66
IV.TRIF.CHN. ML:0.0 0.00022756995000000003 0.1856 AML other m 2020-03-21T12:08:48.13
IV.TRIF.CHE. ML:0.0 0.0003020245 0.1408 AML other m 2020-03-21T12:08:48.16
IV.SEI.HHN. ML:0.0 0.00048203005 0.2752 AML other m 2020-03-21T12:08:48.68
IV.RONT.HHN. ML:0.0 0.00047068494999999997 0.16 AML other m 2020-03-21T12:08:48.83
GU.CARD.HHN. ML:0.0 0.00017743815000000003 0.1216 AML other m 2020-03-21T12:08:51.02
IV.RONT.HHE. ML:0.0 0.0006850562 0.3008 AML other m 2020-03-21T12:08:49.50
IV.SEI.HHE. ML:0.0 0.0002006854 0.3392 AML other m 2020-03-21T12:08:50.14
IV.RINC.HHN. ML:0.0 0.00008869169 0.3968 AML other m 2020-03-21T12:08:49.15
GU.CARD.HHE. ML:0.0 0.00012958354999999998 0.1408 AML other m 2020-03-21T12:08:51.93
IV.RINC.HHE. ML:0.0 0.00011658895 0.3968 AML other m 2020-03-21T12:08:52.51
IV.BDI.HHN. ML:0.0 0.00009274541 0.1408 AML other m 2020-03-21T12:08:52.87
IV.BDI.HHE. ML:0.0 0.00013088225 0.32 AML other m 2020-03-21T12:08:53.01
IV.LMD.HHE. ML:0.0 0.000037566349999999997 0.1408 AML other m 2020-03-21T12:08:54.13
MN.VLC.HHN. ML:0.0 0.000050076355000000004 0.4992 AML other m 2020-03-21T12:08:55.57
MN.VLC.HHE. ML:0.0 0.000026313185 0.256 AML other m 2020-03-21T12:08:54.67
IV.LMD.HHN. ML:0.0 0.000042558305 0.1792 AML other m 2020-03-21T12:08:56.20
IV.PARC.HHN. ML:0.0 0.000034049999999999994 0.52 AML other m 2020-03-21T12:08:59.52
IV.ARCI.HHN. ML:0.0 0.000021765415000000004 0.5184 AML other m 2020-03-21T12:09:00.11
IV.ARCI.HHE. ML:0.0 0.000019967515 0.3968 AML other m 2020-03-21T12:09:00.85
IV.PARC.HHE. ML:0.0 0.00002220298 0.4608 AML other m 2020-03-21T12:09:04.07
IV.BDI.HNE. ML:1.8 0.00015088270000000002 0.3712 AML other m 2020-03-21T12:08:53.18
IV.BDI.HNN. ML:1.8 0.00013433645 0.2624 AML other m 2020-03-21T12:08:53.29
TV.SF04.EHE. ML:1.6 0.000041283249999999995 0.1408 AML other m 2020-03-21T12:09:02.98
TV.SF04.EHN. ML:1.8 0.000054778389999999996 0.3968 AML other m 2020-03-21T12:09:03.00
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