Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.6 on date 06-04-2021 and time 03:45:34 (UTC) in region 5 km W Premilcuore (FC)

A magnitude ML 1.6 earthquake occured in region: 5 km W Premilcuore (FC), on

  • 06-04-2021 03:45:34 (UTC)
  • 06-04-2021 05:45:34 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.9610, 11.7200 at 12 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
Premilcuore FC 5 799 799
San Godenzo FI 9 1167 1966
Portico e San Benedetto FC 9 756 2722
Tredozio FC 13 1212 3934
Rocca San Casciano FC 15 1910 5844
Santa Sofia FC 15 4136 9980
Marradi FI 15 3139 13119
Galeata FC 16 2516 15635
Londa FI 17 1840 17475
Dicomano FI 17 5515 22990
Civitella di Romagna FC 18 3786 26776
Pratovecchio Stia AR 19 5845 32621

Municipalities with at least 50000 inhabitants

An earthquake occurred to
39 Km SW of Faenza (58541 inhabitants)
39 Km SW of Forlì (117913 inhabitants)
43 Km E of Firenze (382808 inhabitants)
44 Km S of Imola (69797 inhabitants)
46 Km W of Cesena (96758 inhabitants)
49 Km E of Scandicci (50609 inhabitants)
51 Km E of Prato (191150 inhabitants)
57 Km N of Arezzo (99543 inhabitants)
64 Km SW of Ravenna (159116 inhabitants)
64 Km E of Pistoia (90315 inhabitants)
67 Km SE of Bologna (386663 inhabitants)
69 Km W of Rimini (147750 inhabitants)
78 Km NE of Siena (53903 inhabitants)
96 Km W of Pesaro (94582 inhabitants)
98 Km S of Ferrara (133155 inhabitants)
98 Km E of Lucca (89046 inhabitants)
99 Km SE 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 1.6 2021-04-06
03:45:34		 43.9613 11.7195 12 2021-07-12
16:55:06		 Bollettino Sismico Italiano INGV 89252251
Reviewed
Rev100 		ML 1.6 2021-04-06
03:45:34		 43.961 11.725 11 2021-04-06
03:51:54		 Sala Sismica INGV-Roma 88807191
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-04-06 03:45:34 ± 0.07
Latitude 43.9613 ± 0.0036
Longitude 11.7195 ± 0.0050
Depth (km) 12 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 89252251

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 393
Semi-minor axis of confidence ellipse (meter) 202
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 220
Circular confidence region, given by single value of horizontal uncertainty (meter) 390.0
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 32
Number of defining phases 20
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.23
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.38131
Number of stations at which the event was observed 20
Number of stations from which data was used for origin computation 10
Magnitudes information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.3
Num. used stations 12
Type of magnitude ML
Reference to an origin 89252251
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-04-19 09:35:09

ML:1.6

Field Value
Value 1.6
Uncertainty 0.3
Num. used stations 12
Type of magnitude ML
Reference to an origin 88807191
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-04-06 03:51:54
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.ENIC.HHZ. 2021-04-06T03:47:10.17 3.0 undecidable manual Pg 44.400002 0
OT.OT14.EHZ. 2021-04-06T03:46:58.09 3.0 undecidable manual Sg 27.950001 0
IV.ZEN8.EHZ. 2021-04-06T03:46:43.85 3.0 undecidable manual Sg 4.88 0
IV.MSSA.HHZ. 2021-04-06T03:46:32.48 3.0 undecidable manual Sg -0.14 0
IV.AGLI.HHZ. 2021-04-06T03:46:12.12 3.0 undecidable manual Pg 14.92 0
IV.CSP1.EHZ. 2021-04-06T03:46:07.60 3.0 undecidable manual Sg 4.16 0
IV.MILN.HNZ. 2021-04-06T03:46:07.36 3.0 undecidable manual Pn 6.3 0
IV.RM33.HNZ. 2021-04-06T03:46:04.21 3.0 undecidable manual Sn -0.16 0
IV.SSFR.HNZ. 2021-04-06T03:46:03.60 3.0 undecidable manual Sg -0.33 0
IV.ZEN8.EHZ. 2021-04-06T03:45:59.21 3.0 undecidable manual Pn 4.01 0
IV.SACS.HHZ. 2021-04-06T03:45:51.71 3.0 undecidable manual Sn -9.99 0
IV.CRE.HHZ. 2021-04-06T03:45:48.51 0.1 undecidable manual S 154 42.3243 92 -0.2 91
IV.VISG.HHZ. 2021-04-06T03:45:46.16 0.1 undecidable manual S 318 33.9438 93 -0.33 90
IV.BRIS.HHZ. 2021-04-06T03:45:45.73 0.1 undecidable manual S 7 29.4483 94 0.45 89
IV.SEI.HHZ. 2021-04-06T03:45:45.48 0.1 undecidable manual S 290 30.5472 94 -0.1 95
IV.RONT.HHZ. 2021-04-06T03:45:43.92 0.1 undecidable manual S 279 23.1546 97 0.31 92
IV.CRE.HHZ. 2021-04-06T03:45:42.70 0.3 undecidable manual P 154 42.3243 92 -0.19 68
IV.ASQU.HHZ. 2021-04-06T03:45:42.50 0.1 undecidable manual S 163 19.0698 100 -0.04 98
IV.RUFI.EHZ. 2021-04-06T03:45:42.85 0.1 undecidable manual S 231 21.6672 98 -0.36 92
IV.BRIS.HHZ. 2021-04-06T03:45:41.04 0.1 undecidable manual P 7 29.4483 94 0.12 95
IV.VISG.HHZ. 2021-04-06T03:45:41.62 0.3 undecidable manual P 318 33.9438 93 0.01 72
IV.RINC.HHZ. 2021-04-06T03:45:41.13 0.1 undecidable manual S 227 12.2766 119 0.32 93
IV.LMD.HHZ. 2021-04-06T03:45:40.74 0.1 undecidable manual S 356 12.876 116 -0.23 96
IV.SEI.HHZ. 2021-04-06T03:45:40.77 0.6 undecidable manual P 290 30.5472 94 -0.32 45
IV.SFI.HNN. 2021-04-06T03:45:40.73 0.1 undecidable manual S 122 11.9769 120 -0.01 100
IV.CSP1.EHZ. 2021-04-06T03:45:40.87 3.0 undecidable manual P 5.63 0
IV.ASQU.HHZ. 2021-04-06T03:45:39.38 0.1 positive manual P 163 19.0698 100 0.05 98
IV.RUFI.EHZ. 2021-04-06T03:45:39.71 0.1 positive manual P 231 21.6672 98 -0.01 98
IV.RONT.HHZ. 2021-04-06T03:45:39.99 0.1 undecidable manual P 279 23.1546 97 0.04 98
IV.SFI.HNN. 2021-04-06T03:45:38.36 0.1 negative manual P 122 11.9769 120 0.06 99
IV.LMD.HHZ. 2021-04-06T03:45:38.29 0.1 negative manual P 356 12.876 116 -0.14 97
IV.RINC.HHZ. 2021-04-06T03:45:38.60 0.1 positive manual P 227 12.2766 119 0.27 94
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.LMD.HHN. ML:2.1 0.0012000000000000001 0.12 AML other m 2021-04-06T03:45:40.89
IV.LMD.HHE. ML:1.9 0.000744 1.8 AML other m 2021-04-06T03:45:41.97
IV.RINC.HHE. ML:1.6 0.0004165 0.32 AML other m 2021-04-06T03:45:41.48
IV.RINC.HHN. ML:1.6 0.0003635 0.32 AML other m 2021-04-06T03:45:41.44
IV.ASQU.HHE. ML:1.5 0.000252 0.36 AML other m 2021-04-06T03:45:42.61
IV.ASQU.HHN. ML:1.4 0.000199 0.26 AML other m 2021-04-06T03:45:42.71
IV.RONT.HHE. ML:1.9 0.0005344999999999999 0.44 AML other m 2021-04-06T03:45:44.54
IV.RONT.HHN. ML:1.8 0.000418 0.64 AML other m 2021-04-06T03:45:45.62
IV.VISG.HHE. ML:1.2 0.00006295000000000001 0.42 AML other m 2021-04-06T03:45:45.85
IV.BRIS.HHE. ML:1.5 0.00016149999999999997 0.3 AML other m 2021-04-06T03:45:47.51
IV.VISG.HHN. ML:1.0 0.00004356 0.56 AML other m 2021-04-06T03:45:48.70
IV.BRIS.HHN. ML:1.5 0.0001535 0.74 AML other m 2021-04-06T03:45:50.00
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