Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.0 on date 05-10-2021 and time 09:28:42 (UTC) in region 2 km N Premilcuore (FC)

A magnitude ML 1.0 earthquake occured in region: 2 km N Premilcuore (FC), on

  • 05-10-2021 09:28:42 (UTC)
  • 05-10-2021 11:28:42 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.9980, 11.7800 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 2 799 799
Portico e San Benedetto FC 3 756 1555
Rocca San Casciano FC 9 1910 3465
Tredozio FC 10 1212 4677
Galeata FC 11 2516 7193
Santa Sofia FC 12 4136 11329
Civitella di Romagna FC 13 3786 15115
San Godenzo FI 15 1167 16282
Marradi FI 16 3139 19421
Dovadola FC 16 1653 21074
Modigliana FC 18 4560 25634
Predappio FC 20 6346 31980

Municipalities with at least 50000 inhabitants

An earthquake occurred to
33 Km SW of Forlì (117913 inhabitants)
33 Km S of Faenza (58541 inhabitants)
40 Km S of Imola (69797 inhabitants)
40 Km W of Cesena (96758 inhabitants)
49 Km NE of Firenze (382808 inhabitants)
55 Km E of Scandicci (50609 inhabitants)
56 Km E of Prato (191150 inhabitants)
58 Km SW of Ravenna (159116 inhabitants)
60 Km N of Arezzo (99543 inhabitants)
63 Km W of Rimini (147750 inhabitants)
65 Km SE of Bologna (386663 inhabitants)
69 Km E of Pistoia (90315 inhabitants)
84 Km NE of Siena (53903 inhabitants)
91 Km W of Pesaro (94582 inhabitants)
94 Km S of Ferrara (133155 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
Reviewed
Rev100 		ML 1.0 2021-10-05
09:28:42		 43.9982 11.78 9 2021-10-05
09:43:11		 Sala Sismica INGV-Roma 96252081
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-05 09:28:42 ± 0.22
Latitude 43.9982 ± 0.0045
Longitude 11.7800 ± 0.0075
Depth (km) 9 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 96252081

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 533
Semi-minor axis of confidence ellipse (meter) 467
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 236
Circular confidence region, given by single value of horizontal uncertainty (meter) 530.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 186
Number of associated phases, regardless of their use for origin computation 13
Number of defining phases 10
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.18
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.30847
Number of stations at which the event was observed 7
Number of stations from which data was used for origin computation 5
Magnitude information

ML:1.0

Field Value
Value 1.0
Uncertainty 0.1
Num. used stations 4
Type of magnitude ML
Reference to an origin 96252081
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-05 09:43:11
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.FOSV.EHZ. 2021-10-05T09:29:20.28 3.0 undecidable manual S -1.28 0
IV.ARRO.EHZ. 2021-10-05T09:29:14.93 3.0 negative manual Pg 1.58 0
IV.FOSV.EHZ. 2021-10-05T09:28:59.12 3.0 undecidable manual P -5.73 0
IV.SEI.HHZ. 2021-10-05T09:28:54.59 0.3 undecidable manual S 281 34.2435 50 0.46 68
IV.RUFI.EHZ. 2021-10-05T09:28:52.18 0.3 undecidable manual S 231 27.9498 108 -0.09 73
IV.ASQU.HHZ. 2021-10-05T09:28:50.58 0.3 undecidable manual S 178 22.3554 112 0.14 72
IV.SEI.HHZ. 2021-10-05T09:28:49.03 0.1 undecidable manual P 281 34.2435 50 -0.01 94
IV.RUFI.EHZ. 2021-10-05T09:28:47.84 0.1 undecidable manual P 231 27.9498 108 -0.12 95
IV.SFI.HNZ. 2021-10-05T09:28:47.07 0.3 undecidable manual S 153 11.6772 128 -0.11 74
IV.LMD.HHZ. 2021-10-05T09:28:46.82 0.3 undecidable manual S 327 10.5783 130 -0.06 75
IV.ASQU.HHZ. 2021-10-05T09:28:46.92 0.1 undecidable manual P 178 22.3554 112 0.02 98
IV.SFI.HNZ. 2021-10-05T09:28:45.09 0.1 undecidable manual P 153 11.6772 128 0.07 100
IV.LMD.HHZ. 2021-10-05T09:28:44.89 0.1 undecidable manual P 327 10.5783 130 0.04 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.ASQU.HHE. ML:1.0 0.00006706146 0.1216 AML other m 2021-10-05T09:28:51.12
IV.ASQU.HHN. ML:1.1 0.0000778754175 0.1984 AML other m 2021-10-05T09:28:50.71
IV.LMD.HHE. ML:1.0 0.00014344580000000002 0.1408 AML other m 2021-10-05T09:28:47.05
IV.LMD.HHN. ML:0.9 0.000095197225 0.16 AML other m 2021-10-05T09:28:47.56
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