Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.1 on date 16-05-2021 and time 23:12:59 (Italy) in region 7 km SW Premilcuore (FC)

A magnitude ML 1.1 earthquake occured in region: 7 km SW Premilcuore (FC), on

  • 16-05-2021 21:12:59 (UTC)
  • 16-05-2021 23:12:59 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.9400, 11.7130 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
Premilcuore FC 7 799 799
San Godenzo FI 8 1167 1966
Portico e San Benedetto FC 11 756 2722
Londa FI 15 1840 4562
Santa Sofia FC 16 4136 8698
Tredozio FC 16 1212 9910
Dicomano FI 16 5515 15425
Pratovecchio Stia AR 17 5845 21270
Galeata FC 17 2516 23786
Rocca San Casciano FC 17 1910 25696
Marradi FI 17 3139 28835
Civitella di Romagna FC 20 3786 32621
Vicchio FI 20 8044 40665

Municipalities with at least 50000 inhabitants

An earthquake occurred to
41 Km SW of Faenza (58541 inhabitants)
41 Km SW of Forlì (117913 inhabitants)
41 Km E of Firenze (382808 inhabitants)
46 Km S of Imola (69797 inhabitants)
47 Km E of Scandicci (50609 inhabitants)
48 Km W of Cesena (96758 inhabitants)
50 Km E of Prato (191150 inhabitants)
54 Km N of Arezzo (99543 inhabitants)
64 Km E of Pistoia (90315 inhabitants)
66 Km SW of Ravenna (159116 inhabitants)
68 Km SE of Bologna (386663 inhabitants)
70 Km W of Rimini (147750 inhabitants)
76 Km NE of Siena (53903 inhabitants)
96 Km W of Pesaro (94582 inhabitants)
98 Km E of Lucca (89046 inhabitants)
100 Km S of Ferrara (133155 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 2021-05-16
21:12:59		 43.9403 11.7133 9 2021-05-16
22:43:19		 Sala Sismica INGV-Roma 90176311
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-05-16 21:12:59 ± 0.07
Latitude 43.9403 ± 0.0027
Longitude 11.7133 ± 0.0037
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 90176311

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 318
Semi-minor axis of confidence ellipse (meter) 80
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 68
Circular confidence region, given by single value of horizontal uncertainty (meter) 320.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 102
Number of associated phases, regardless of their use for origin computation 17
Number of defining phases 16
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) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.36423
Number of stations at which the event was observed 9
Number of stations from which data was used for origin computation 8
Magnitude information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.2
Num. used stations 10
Type of magnitude ML
Reference to an origin 90176311
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-05-16 22:43:19
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
TV.SF04.EHZ. 2021-05-16T21:13:32.04 3.0 undecidable manual S -1.18 0
IV.CRE.HHZ. 2021-05-16T21:13:13.51 0.6 undecidable manual S 152 40.4262 50 0.09 47
IV.SEI.HHZ. 2021-05-16T21:13:11.00 0.3 undecidable manual S 294 31.0467 106 0.17 71
IV.BRIS.HHZ. 2021-05-16T21:13:11.64 0.6 undecidable manual S 8 31.8459 105 0.55 43
IV.RUFI.EHE. 2021-05-16T21:13:07.04 0.3 undecidable manual S 235 19.869 114 -0.14 73
IV.CRE.HHZ. 2021-05-16T21:13:07.39 0.3 undecidable manual P 152 40.4262 50 -0.21 69
IV.BRIS.HHZ. 2021-05-16T21:13:06.28 0.1 undecidable manual P 8 31.8459 105 0.02 97
IV.ASQU.HHZ. 2021-05-16T21:13:06.25 0.6 undecidable manual S 159 17.0718 117 -0.05 50
IV.SEI.HHZ. 2021-05-16T21:13:05.96 0.1 undecidable manual P 294 31.0467 106 -0.14 95
IV.LMD.HHZ. 2021-05-16T21:13:05.39 0.3 undecidable manual S 358 15.1737 120 -0.35 70
IV.RINC.HHZ. 2021-05-16T21:13:04.38 0.3 undecidable manual S 235 10.3785 130 0.02 76
IV.SFI.EHZ. 2021-05-16T21:13:04.58 0.3 undecidable manual S 110 11.3775 128 -0.05 75
IV.RUFI.EHE. 2021-05-16T21:13:04.03 0.1 undecidable manual P 235 19.869 114 0.04 99
IV.ASQU.HHZ. 2021-05-16T21:13:03.59 0.1 undecidable manual P 159 17.0718 117 0.1 98
IV.LMD.HHZ. 2021-05-16T21:13:03.06 0.1 positive manual P 358 15.1737 120 -0.1 99
IV.RINC.HHZ. 2021-05-16T21:13:02.49 0.1 undecidable manual P 235 10.3785 130 0.12 99
IV.SFI.EHZ. 2021-05-16T21:13:02.59 0.1 undecidable manual P 110 11.3775 128 0.07 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.RINC.HHN. ML:1.0 0.00012325 0.3 AML other m 2021-05-16T21:13:04.62
IV.RINC.HHE. ML:1.2 0.0002195 0.34 AML other m 2021-05-16T21:13:04.58
IV.SFI.EHE. ML:1.0 0.000121 0.1 AML other m 2021-05-16T21:13:04.75
IV.SFI.EHN. ML:0.8 0.0000837 0.1 AML other m 2021-05-16T21:13:04.66
IV.LMD.HHE. ML:1.2 0.000156 0.28 AML other m 2021-05-16T21:13:05.61
IV.LMD.HHN. ML:1.1 0.000131 1.14 AML other m 2021-05-16T21:13:05.85
IV.ASQU.HHN. ML:0.9 0.00006634999999999999 0.6 AML other m 2021-05-16T21:13:06.62
IV.ASQU.HHE. ML:0.9 0.00007395000000000001 1.18 AML other m 2021-05-16T21:13:07.33
IV.SEI.HHN. ML:1.4 0.000122 0.26 AML other m 2021-05-16T21:13:11.32
IV.SEI.HHE. ML:1.1 0.0000571 0.78 AML other m 2021-05-16T21:13:11.68
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