Earthquake with magnitude of ML 0.9 on date 21-09-2021 and time 07:39:45 (UTC) in region 4 km N Vaglia (FI)

A magnitude ML 0.9 earthquake occured in region: 4 km N Vaglia (FI), on

  • 21-09-2021 07:39:45 (UTC)
  • 21-09-2021 09:39:45 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.939, 11.277 at 6 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.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Vaglia FI 4 5073 5073
Scarperia e San Piero FI 5 12217 17290
Barberino di Mugello FI 8 10836 28126
Borgo San Lorenzo FI 9 18211 46337
Calenzano FI 12 17489 63826
Vaiano PO 13 9895 73721
Sesto Fiorentino FI 13 48958 122679
Fiesole FI 15 13969 136648
Vicchio FI 15 8044 144692
Prato PO 16 191150 335842
Vernio PO 16 6060 341902
Cantagallo PO 17 3105 345007
Campi Bisenzio FI 17 46166 391173
Firenze FI 19 382808 773981
Montemurlo PO 19 18456 792437

Municipalities with at least 50000 inhabitants

An earthquake occurred to
16 Km E of Prato (191150 inhabitants)
19 Km N of Firenze (382808 inhabitants)
21 Km NE of Scandicci (50609 inhabitants)
29 Km E of Pistoia (90315 inhabitants)
58 Km SW of Imola (69797 inhabitants)
62 Km SW of Faenza (58541 inhabitants)
62 Km S of Bologna (386663 inhabitants)
63 Km E of Lucca (89046 inhabitants)
69 Km W of Forlì (117913 inhabitants)
69 Km N of Siena (53903 inhabitants)
72 Km NW of Arezzo (99543 inhabitants)
74 Km E of Pisa (89158 inhabitants)
80 Km W of Cesena (96758 inhabitants)
83 Km E of Viareggio (62467 inhabitants)
84 Km SE of Modena (184973 inhabitants)
89 Km E of Livorno (159219 inhabitants)
91 Km SW of Ravenna (159116 inhabitants)
91 Km E of Massa (69479 inhabitants)
96 Km E of Carrara (63133 inhabitants)
99 Km SE of Reggio nell'Emilia (171345 inhabitants)
99 Km SE of Carpi (70699 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
Felt maps
Preliminary map of the earthquake effects from the web questionnaire

Preliminary map of the earthquake effects from the web questionnaire

This map shows the distribution of the effects of the earthquake on the territory in terms of the MCS (Mercalli-Cancani-Sieberg) intensity scale. The intensities are determined using the data provided in the questionnaire (http://www.haisentitoilterremoto.it/) that are analysed using robust statistical techniques since they are not verified individually. Specifically, the assignment of MCS intensities greater or equal the VI degree of the MCS scale require opportune in situ verification by professional experts. The purple start shows the epicenter. This map is prepared every so often that the population fill in new questionnaires. The number of questionnaires used to determine the map and the date and time of the last adjournment are shown in the upper right part of the panel.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100
ML 0.9 2021-09-21
07:39:45
43.939 11.2773 6 2021-09-21
08:00:12
Sala Sismica INGV-Roma 95690221
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-21 07:39:45 ± 0.17
Latitude 43.9390 ± 0.0054
Longitude 11.2773 ± 0.0062
Depth (km) 6 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 95690221

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 659
Semi-minor axis of confidence ellipse (meter) 184
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 199
Circular confidence region, given by single value of horizontal uncertainty (meter) 660
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 115
Number of associated phases, regardless of their use for origin computation 35
Number of defining phases 12
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.21
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.27429
Number of stations at which the event was observed 30
Number of stations from which data was used for origin computation 8
Magnitude information

ML:0.9

Field Value
Value 0.9
Uncertainty 0.1
Num. used stations 7
Type of magnitude ML
Reference to an origin 95690221
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-21 08:00:12
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
AC.KBN.HHZ. 2021-09-21T07:41:41.75 3.0 undecidable manual Pn 3.69 0
IV.HSRS.HHZ. 2021-09-21T07:41:37.24 3.0 positive manual Pn 4.9 0
IV.PIPA.HHZ. 2021-09-21T07:41:31.06 3.0 negative manual Pg 17.26 0
GE.MATE.HHZ. 2021-09-21T07:41:16.49 3.0 undecidable manual Pg 14.63 0
IX.PGN3.HHZ.02 2021-09-21T07:41:08.62 3.0 positive manual Pg 13.06 0
IV.SNAL.HHZ. 2021-09-21T07:41:02.14 3.0 undecidable manual Pg 14.35 0
IV.CDRU.HNZ. 2021-09-21T07:41:00.49 3.0 undecidable manual Pg 7.61 0
GU.MGRO.HHZ. 2021-09-21T07:40:59.37 3.0 undecidable manual Sn 3.64 0
IV.VIVA.HHZ. 2021-09-21T07:40:55.56 3.0 undecidable manual Sn 0.63 0
IV.TOLF.HHZ. 2021-09-21T07:40:44.91 3.0 undecidable manual Sg 2.63 0
IV.MRB1.HHZ. 2021-09-21T07:40:42.25 3.0 positive manual Pn -1.86 0
IV.COLB.HHZ. 2021-09-21T07:40:39.08 3.0 undecidable manual Pn -2.77 0
OX.FUSE.HNZ. 2021-09-21T07:40:38.61 3.0 undecidable manual Pg 8.97 0
NI.VINO.HHZ. 2021-09-21T07:40:31.46 3.0 undecidable manual Pn 2.42 0
IV.LAV9.HNZ. 2021-09-21T07:40:21.63 3.0 undecidable manual Pn -2.36 0
IV.PE3.EHZ. 2021-09-21T07:40:18.19 3.0 undecidable manual S -0.29 0
GU.RNCA.HHZ. 2021-09-21T07:40:15.33 3.0 undecidable manual Pg 1.39 0
IV.RIBO.EHZ.01 2021-09-21T07:40:11.12 3.0 undecidable manual S -5.63 0
IV.CADC.EHZ. 2021-09-21T07:40:11.99 3.0 undecidable manual Pn -2.59 0
IV.PE3.EHZ. 2021-09-21T07:40:03.16 3.0 positive manual P 0.19 0
IV.MTRZ.HNZ. 2021-09-21T07:40:02.39 3.0 undecidable manual S 0.02 0
IV.VISG.HHE. 2021-09-21T07:39:55.97 1.0 undecidable manual S 24 0.2743 102 0.01 25
IV.RUFI.EHZ. 2021-09-21T07:39:52.98 1.0 undecidable manual S 121 0.1952 106 -0.03 25
IV.CRMI.HNZ. 2021-09-21T07:39:51.24 0.1 undecidable manual P 236 0.2581 102 0.18 95
IV.VISG.HHE. 2021-09-21T07:39:51.44 0.3 undecidable manual P 24 0.2743 102 0.03 73
IV.FNVD.HHE. 2021-09-21T07:39:51.08 0.3 undecidable manual P 334 0.2545 102 0.1 72
IV.RUFI.EHZ. 2021-09-21T07:39:49.72 0.1 undecidable manual P 121 0.1952 106 0.01 99
IV.MOCL.EHZ. 2021-09-21T07:39:49.84 1.0 undecidable manual S 314 0.0953 120 0.37 23
IV.SEI.HHE. 2021-09-21T07:39:48.56 0.6 undecidable manual P 27 0.1295 114 0.24 48
IV.MPPT.EHZ. 2021-09-21T07:39:48.42 0.1 undecidable manual P 278 0.1358 112 -0.04 100
IV.BOSL.HHZ. 2021-09-21T07:39:48.99 0.6 undecidable manual S 97 0.0701 129 0.34 48
IV.MOCL.EHZ. 2021-09-21T07:39:47.34 0.1 undecidable manual P 314 0.0953 120 -0.32 95
IV.BOSL.HHZ. 2021-09-21T07:39:46.76 0.3 positive manual P 97 0.0701 129 -0.43 70
IV.FIR.HHZ. 2021-09-21T07:39:45.88 3.0 undecidable manual P 0.52 0
IT.FIE.HGZ. 2021-09-21T07:39:45.50 3.0 undecidable manual P 0.21 0
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.BOSL.HHN. ML:0.7 9.9617195E-5 0.4352 AML other m 2021-09-21T07:39:50.79
IV.MOCL.EHE. ML:1 0.0001495 0.16 AML other m 2021-09-21T07:39:50.58
IV.BOSL.HHE. ML:0.9 0.000162 1.42 AML other m 2021-09-21T07:39:50.04
IV.MOCL.EHN. ML:0.8 0.000101844505 0.2432 AML other m 2021-09-21T07:39:52.17
IV.MPPT.EHE. ML:1 9.919434E-5 0.8256 AML other m 2021-09-21T07:39:58.51
IV.MPPT.EHN. ML:1 9.7579475E-5 0.2176 AML other m 2021-09-21T07:39:52.70
IV.RUFI.EHE. ML:0.7 3.29718195E-5 0.6208 AML other m 2021-09-21T07:39:57.41
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