Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.1 on date 09-11-2021 and time 16:21:35 (UTC) in region 3 km SW Portico e San Benedetto (FC)

A magnitude ML 1.1 earthquake occured in region: 3 km SW Portico e San Benedetto (FC), on

  • 09-11-2021 16:21:35 (UTC)
  • 09-11-2021 17:21:35 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 44.0050, 11.7650 at 10 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.

Hai sentito il terremoto? Clicca qui

Did you feel it? Fill in the questionnaire.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Portico e San Benedetto FC 3 756 756
Premilcuore FC 3 799 1555
Tredozio FC 9 1212 2767
Rocca San Casciano FC 9 1910 4677
Galeata FC 12 2516 7193
Santa Sofia FC 13 4136 11329
Civitella di Romagna FC 14 3786 15115
San Godenzo FI 14 1167 16282
Marradi FI 15 3139 19421
Dovadola FC 16 1653 21074
Modigliana FC 17 4560 25634

Municipalities with at least 50000 inhabitants

An earthquake occurred to
33 Km SW of Faenza (58541 inhabitants)
33 Km SW of Forlì (117913 inhabitants)
39 Km S of Imola (69797 inhabitants)
41 Km W of Cesena (96758 inhabitants)
48 Km NE of Firenze (382808 inhabitants)
54 Km NE of Scandicci (50609 inhabitants)
55 Km E of Prato (191150 inhabitants)
58 Km SW of Ravenna (159116 inhabitants)
61 Km N of Arezzo (99543 inhabitants)
64 Km SE of Bologna (386663 inhabitants)
64 Km W of Rimini (147750 inhabitants)
68 Km E of Pistoia (90315 inhabitants)
84 Km NE of Siena (53903 inhabitants)
93 Km W of Pesaro (94582 inhabitants)
93 Km S of Ferrara (133155 inhabitants)
98 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 1.1 2021-11-09
16:21:35		 44.0048 11.7648 10 2022-03-30
13:04:40		 Bollettino Sismico Italiano INGV 101649061
Reviewed
Rev100 		ML 1.1 2021-11-09
16:21:35		 44.0005 11.77 11 2021-11-09
16:28:22		 Sala Sismica INGV-Roma 97365381
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-11-09 16:21:35 ± 0.07
Latitude 44.0048 ± 0.0036
Longitude 11.7648 ± 0.0075
Depth (km) 10 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 101649061

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 537
Semi-minor axis of confidence ellipse (meter) 315
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 86
Circular confidence region, given by single value of horizontal uncertainty (meter) 540.0
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 27
Number of defining phases 13
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.19
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.40829
Number of stations at which the event was observed 21
Number of stations from which data was used for origin computation 7
Magnitudes information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.1
Num. used stations 2
Type of magnitude ML
Reference to an origin 101649061
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2022-03-03 16:50:38

ML:1.1

Field Value
Value 1.1
Uncertainty 0.1
Num. used stations 2
Type of magnitude ML
Reference to an origin 97365381
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-11-09 16:28:22
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IX.COL3.HHZ.02 2021-11-09T16:23:15.66 3.0 undecidable manual Sg 3.32 0
AC.VLO.HHZ. 2021-11-09T16:23:12.90 3.0 positive manual Pg 11.25 0
IX.CMP3.EHZ.02 2021-11-09T16:23:10.95 3.0 undecidable manual Sg 0.67 0
IY.OPPI.HHZ. 2021-11-09T16:23:05.31 3.0 positive manual Pg 6.63 0
CH.BERNI.HHZ. 2021-11-09T16:22:54.28 3.0 undecidable manual Sn -6.09 0
IV.PAOL.HHZ. 2021-11-09T16:22:51.58 3.0 undecidable manual Sg -5.69 0
IV.MARS.HNZ. 2021-11-09T16:22:50.00 3.0 negative manual Pn -5.81 0
IV.ESCV.HHZ. 2021-11-09T16:22:48.55 3.0 positive manual Pn -9.99 0
IV.BAG8.EHZ. 2021-11-09T16:22:45.83 3.0 undecidable manual Sg 1.73 0
IV.MCPD.HHZ. 2021-11-09T16:22:44.37 3.0 positive manual Pn -9.99 0
IV.MILN.HNZ. 2021-11-09T16:22:44.73 3.0 undecidable manual Sn -6.54 0
IV.MSSA.HHZ. 2021-11-09T16:22:36.81 3.0 undecidable manual Sn 4.36 0
IV.CSFT.HHZ. 2021-11-09T16:22:17.76 3.0 negative manual Pg -0.59 0
IV.CRE.HHE. 2021-11-09T16:21:50.51 0.6 undecidable manual S 161 45.3213 50 0.44 44
IV.PP3.EHZ. 2021-11-09T16:21:47.40 3.0 undecidable manual Sn -9.99 0
IV.VISG.HHZ. 2021-11-09T16:21:46.98 0.6 undecidable manual S 308 33.3444 50 0.12 48
IV.RUFI.EHZ. 2021-11-09T16:21:45.36 0.3 undecidable manual S 228 27.5502 109 0.06 74
IV.ASQU.HHN. 2021-11-09T16:21:44.17 0.6 undecidable manual S 175 23.1546 112 0.29 47
IV.BRIS.HHZ. 2021-11-09T16:21:44.65 0.6 undecidable manual S 0 24.3534 111 0.38 46
IV.CRE.HHE. 2021-11-09T16:21:43.57 0.3 undecidable manual P 161 45.3213 50 -0.2 70
IV.VISG.HHZ. 2021-11-09T16:21:41.66 0.1 undecidable manual P 308 33.3444 50 -0.26 94
IV.BOSL.HHE. 2021-11-09T16:21:41.80 0.1 undecidable manual P 255 32.2455 50 0.05 98
IV.ASQU.HHN. 2021-11-09T16:21:40.17 0.1 undecidable manual P 175 23.1546 112 -0.03 100
IV.BRIS.HHZ. 2021-11-09T16:21:40.41 0.3 undecidable manual P 0 24.3534 111 -0.01 75
IV.SFI.EHZ. 2021-11-09T16:21:40.63 0.6 undecidable manual S 149 12.876 127 -0.12 50
IV.RUFI.EHZ. 2021-11-09T16:21:40.98 0.1 positive manual P 228 27.5502 109 -0.04 99
IV.SFI.EHZ. 2021-11-09T16:21:38.27 0.1 undecidable manual P 149 12.876 127 -0.13 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.RUFI.EHN. ML:1.0 0.000056750000000000004 0.46 AML other m 2021-11-09T16:21:41.31
IV.RUFI.EHE. ML:1.1 0.0000635 0.42 AML other m 2021-11-09T16:21:44.28
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