Earthquake with magnitude of ML 1.0 on date 19-12-2021 and time 04:39:35 (Italy) in region 1 km NW Tredozio (FC)

A magnitude ML 1.0 earthquake occured in region: 1 km NW Tredozio (FC), on

  • 19-12-2021 03:39:35 (UTC)
  • 19-12-2021 04:39:35 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 44.0860, 11.7380 at 29 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
Tredozio FC 1 1212 1212
Portico e San Benedetto FC 8 756 1968
Rocca San Casciano FC 9 1910 3878
Modigliana FC 9 4560 8438
Marradi FI 10 3139 11577
Premilcuore FC 13 799 12376
Dovadola FC 13 1653 14029
Brisighella RA 15 7639 21668
Palazzuolo sul Senio FI 16 1154 22822
Galeata FC 17 2516 25338
Casola Valsenio RA 18 2617 27955
Civitella di Romagna FC 18 3786 31741
Predappio FC 20 6346 38087
Castrocaro Terme e Terra del Sole FC 20 6426 44513
San Godenzo FI 20 1167 45680

Municipalities with at least 50000 inhabitants

An earthquake occurred to
25 Km SW of Faenza (58541 inhabitants)
29 Km SW of Forlì (117913 inhabitants)
30 Km S of Imola (69797 inhabitants)
41 Km W of Cesena (96758 inhabitants)
52 Km SW of Ravenna (159116 inhabitants)
52 Km NE of Firenze (382808 inhabitants)
55 Km SE of Bologna (386663 inhabitants)
56 Km E of Prato (191150 inhabitants)
58 Km NE of Scandicci (50609 inhabitants)
66 Km W of Rimini (147750 inhabitants)
68 Km E of Pistoia (90315 inhabitants)
70 Km N of Arezzo (99543 inhabitants)
84 Km S of Ferrara (133155 inhabitants)
90 Km SE of Modena (184973 inhabitants)
91 Km NE of Siena (53903 inhabitants)
96 Km W of Pesaro (94582 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 2021-12-19
03:39:35
44.0865 11.7382 29 2021-12-19
04:05:50
Sala Sismica INGV-Roma 98711431
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-12-19 03:39:35 ± 0.21
Latitude 44.0865 ± 0.0054
Longitude 11.7382 ± 0.0088
Depth (km) 29 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 98711431

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 799
Semi-minor axis of confidence ellipse (meter) 71
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 54
Circular confidence region, given by single value of horizontal uncertainty (meter) 800.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 149
Number of associated phases, regardless of their use for origin computation 12
Number of defining phases 12
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) 0.13939
Epicentral distance of station farthest from the epicenter (degree) 0.29768
Number of stations at which the event was observed 6
Number of stations from which data was used for origin computation 6
Magnitude information

ML:1.0

Field Value
Value 1.0
Uncertainty 0.1
Num. used stations 2
Type of magnitude ML
Reference to an origin 98711431
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-12-19 04:05:50
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.ASQU.HHZ. 2021-12-19T03:39:48.09 0.3 undecidable manual S 173 32.4453 127 0.13 72
IV.SEI.HHZ. 2021-12-19T03:39:47.52 0.3 undecidable manual S 263 30.4473 129 -0.03 73
IV.RUFI.EHN. 2021-12-19T03:39:47.87 0.3 undecidable manual S 214 33.0447 126 -0.23 70
IV.VISG.HHZ. 2021-12-19T03:39:46.83 0.3 undecidable manual S 295 26.751 133 0.04 74
IV.BRIS.HHZ. 2021-12-19T03:39:45.00 0.3 undecidable manual S 8 15.4734 149 0.11 74
IV.SFI.EHZ. 2021-12-19T03:39:45.91 0.1 undecidable manual S 157 21.9669 139 0 100
IV.RUFI.EHN. 2021-12-19T03:39:42.28 1.0 undecidable manual P 214 33.0447 126 -0.35 23
IV.SEI.HHZ. 2021-12-19T03:39:42.51 0.1 undecidable manual P 263 30.4473 129 0.2 95
IV.ASQU.HHZ. 2021-12-19T03:39:42.78 0.1 undecidable manual P 173 32.4453 127 0.23 94
IV.SFI.EHZ. 2021-12-19T03:39:41.27 0.1 undecidable manual P 157 21.9669 139 -0.1 98
IV.VISG.HHZ. 2021-12-19T03:39:41.81 0.1 undecidable manual P 295 26.751 133 -0.07 98
IV.BRIS.HHZ. 2021-12-19T03:39:40.53 0.3 undecidable manual P 8 15.4734 149 -0.25 72
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SEI.HHE. ML:1.0 0.0000322 0.3 AML other m 2021-12-19T03:39:48.70
IV.SEI.HHN. ML:1.0 0.0000346 0.26 AML other m 2021-12-19T03:39:48.64
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