Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.1 on date 11-08-2020 and time 09:24:41 (UTC) in region 7 km N Scarperia e San Piero (FI)

A magnitude ML 1.1 earthquake occured in region: 7 km N Scarperia e San Piero (FI), on

  • 11-08-2020 09:24:41 (UTC)
  • 11-08-2020 11:24:41 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.0240, 11.3220 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
Scarperia e San Piero FI 7 12217 12217
Barberino di Mugello FI 7 10836 23053
Borgo San Lorenzo FI 9 18211 41264
Firenzuola FI 12 4726 45990
Vaglia FI 13 5073 51063
Vernio PO 14 6060 57123
Vicchio FI 15 8044 65167
Vaiano PO 17 9895 75062
Cantagallo PO 17 3105 78167
Castiglione dei Pepoli BO 19 5648 83815

Municipalities with at least 50000 inhabitants

An earthquake occurred to
24 Km NE of Prato (191150 inhabitants)
29 Km N of Firenze (382808 inhabitants)
32 Km NE of Scandicci (50609 inhabitants)
34 Km E of Pistoia (90315 inhabitants)
48 Km SW of Imola (69797 inhabitants)
53 Km S of Bologna (386663 inhabitants)
54 Km SW of Faenza (58541 inhabitants)
62 Km W of Forlì (117913 inhabitants)
69 Km E of Lucca (89046 inhabitants)
75 Km W of Cesena (96758 inhabitants)
76 Km SE of Modena (184973 inhabitants)
77 Km NW of Arezzo (99543 inhabitants)
78 Km N of Siena (53903 inhabitants)
81 Km E of Pisa (89158 inhabitants)
83 Km SW of Ravenna (159116 inhabitants)
88 Km E of Viareggio (62467 inhabitants)
91 Km SE of Carpi (70699 inhabitants)
93 Km SE of Reggio nell'Emilia (171345 inhabitants)
94 Km S of Ferrara (133155 inhabitants)
94 Km E of Massa (69479 inhabitants)
97 Km NE of Livorno (159219 inhabitants)
98 Km E of Carrara (63133 inhabitants)
100 Km W of Rimini (147750 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 1.1 2020-08-11
09:24:41		 44.0238 11.3218 9 2020-08-11
09:32:54		 Sala Sismica INGV-Roma 81875391
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-08-11 09:24:41 ± 0.1
Latitude 44.0238 ± 0.0054
Longitude 11.3218 ± 0.0050
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 81875391

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 603
Semi-minor axis of confidence ellipse (meter) 299
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 354
Circular confidence region, given by single value of horizontal uncertainty (meter) 600.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 116
Number of associated phases, regardless of their use for origin computation 11
Number of defining phases 11
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.17
Epicentral distance of station closest to the epicenter (degree) 0.04047
Epicentral distance of station farthest from the epicenter (degree) 0.33545
Number of stations at which the event was observed 7
Number of stations from which data was used for origin computation 7
Magnitude information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.3
Num. used stations 9
Type of magnitude ML
Reference to an origin 81875391
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-08-11 09:32:54
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MPPT.EHZ. 2020-08-11T09:24:49.39 0.3 undecidable manual S 248 19.869 114 0.05 74
IV.CRMI.HNE. 2020-08-11T09:24:48.98 0.1 undecidable manual P 227 37.2294 50 -0.22 92
IV.FNVD.HHZ. 2020-08-11T09:24:46.78 0.1 undecidable manual P 315 22.4553 112 0.16 96
IV.MOCL.EHZ. 2020-08-11T09:24:46.73 0.3 undecidable manual S 259 11.4774 128 -0.08 74
IV.VISG.HHZ. 2020-08-11T09:24:46.35 0.3 undecidable manual P 26 20.3685 114 0.12 73
IV.MPPT.EHZ. 2020-08-11T09:24:46.17 0.1 undecidable manual P 248 19.869 114 0.04 99
IV.RONT.HHZ. 2020-08-11T09:24:46.47 0.3 undecidable manual S 111 9.4794 133 0.18 73
IV.RONT.HHZ. 2020-08-11T09:24:44.43 0.1 undecidable manual P 111 9.4794 133 0.05 100
IV.MOCL.EHZ. 2020-08-11T09:24:44.78 0.1 undecidable manual P 259 11.4774 128 0.1 99
IV.SEI.HHZ. 2020-08-11T09:24:44.91 0.3 undecidable manual S 41 4.4955 153 -0.32 71
IV.SEI.HHZ. 2020-08-11T09:24:43.65 0.1 undecidable manual P 41 4.4955 153 -0.12 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SEI.HHN. ML:1.4 0.0004605 0.34 AML other m 2020-08-11T09:24:45.07
IV.SEI.HHE. ML:1.0 0.0001895 0.84 AML other m 2020-08-11T09:24:46.43
IV.RONT.HHE. ML:1.5 0.00042 0.16 AML other m 2020-08-11T09:24:46.58
IV.RONT.HHN. ML:1.4 0.0003135 0.16 AML other m 2020-08-11T09:24:46.94
IV.MOCL.EHE. ML:1.0 0.000131 0.26 AML other m 2020-08-11T09:24:47.23
IV.MOCL.EHN. ML:1.0 0.000129 0.12 AML other m 2020-08-11T09:24:47.33
IV.MPPT.EHE. ML:0.6 0.00002945 0.6 AML other m 2020-08-11T09:24:49.98
IV.MPPT.EHN. ML:0.5 0.00002335 0.62 AML other m 2020-08-11T09:24:50.46
GU.POPM.HHE. ML:1.4 0.00007015 0.08 AML other m 2020-08-11T09:25:04.32
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