Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.5 on date 09-11-2021 and time 08:21:10 (Italy) in region 2 km SW Portico e San Benedetto (FC)

A magnitude ML 1.5 earthquake occured in region: 2 km SW Portico e San Benedetto (FC), on

  • 09-11-2021 07:21:10 (UTC)
  • 09-11-2021 08:21:10 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 44.0080, 11.7650 at 9 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
Portico e San Benedetto FC 3 756 756
Premilcuore FC 4 799 1555
Tredozio FC 8 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
Marradi FI 14 3139 18254
San Godenzo FI 15 1167 19421
Dovadola FC 16 1653 21074
Modigliana FC 17 4560 25634

Municipalities with at least 50000 inhabitants

An earthquake occurred to
32 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)
49 Km NE of Firenze (382808 inhabitants)
54 Km NE of Scandicci (50609 inhabitants)
55 Km E of Prato (191150 inhabitants)
57 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)
97 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 1.5 2021-11-09
07:21:10		 44.0082 11.7648 9 2022-03-30
13:04:19		 Bollettino Sismico Italiano INGV 97937531
Reviewed
Rev100 		ML 1.6 2021-11-09
07:21:10		 44.0047 11.7762 10 2021-11-09
07:34:22		 Sala Sismica INGV-Roma 97358101
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-11-09 07:21:10 ± 0.07
Latitude 44.0082 ± 0.0036
Longitude 11.7648 ± 0.0063
Depth (km) 9 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 97937531

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 511
Semi-minor axis of confidence ellipse (meter) 133
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 69
Circular confidence region, given by single value of horizontal uncertainty (meter) 510.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 136
Number of associated phases, regardless of their use for origin computation 20
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) 0.08094
Epicentral distance of station farthest from the epicenter (degree) 0.49553
Number of stations at which the event was observed 10
Number of stations from which data was used for origin computation 10
Magnitudes information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.2
Num. used stations 10
Type of magnitude ML
Reference to an origin 97358101
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-11-09 07:34:22

ML:1.5

Field Value
Value 1.5
Uncertainty 0.3
Num. used stations 12
Type of magnitude ML
Reference to an origin 97937531
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2022-03-03 16:44:24
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.PARC.HHE. 2021-11-09T07:21:28.45 0.3 undecidable manual S 136 55.0005 50 0.16 68
IV.CRE.HHZ. 2021-11-09T07:21:26.05 0.6 undecidable manual S 161 45.7209 50 0.25 45
IV.VISG.HHZ. 2021-11-09T07:21:22.46 0.6 undecidable manual S 307 33.1446 50 0.03 48
IV.BOSL.HHZ. 2021-11-09T07:21:22.62 0.6 undecidable manual S 255 32.3454 50 0.39 45
IV.SEI.HHZ. 2021-11-09T07:21:22.32 0.6 undecidable manual S 279 32.8449 50 -0.04 48
IV.BRIS.HHZ. 2021-11-09T07:21:20.07 0.1 undecidable manual S 0 23.9538 110 0.56 87
IV.RUFI.EHZ. 2021-11-09T07:21:20.90 0.1 undecidable manual S 227 27.8499 108 0.14 95
IV.PARC.HHE. 2021-11-09T07:21:20.41 0.3 undecidable manual P 136 55.0005 50 -0.42 64
IV.ASQU.HHZ. 2021-11-09T07:21:19.55 0.1 undecidable manual S 175 23.5542 111 0.18 95
IV.CRE.HHZ. 2021-11-09T07:21:19.14 0.1 undecidable manual P 161 45.7209 50 -0.25 90
IV.VISG.HHZ. 2021-11-09T07:21:17.19 0.1 undecidable manual P 307 33.1446 50 -0.26 92
IV.BOSL.HHZ. 2021-11-09T07:21:17.39 0.1 undecidable manual P 255 32.3454 50 0.06 96
IV.SEI.HHZ. 2021-11-09T07:21:17.30 0.1 undecidable manual P 279 32.8449 50 -0.1 95
IV.SFI.EHZ. 2021-11-09T07:21:16.12 0.1 undecidable manual S 150 13.1757 124 -0.04 100
IV.RUFI.EHZ. 2021-11-09T07:21:16.51 0.1 undecidable manual P 227 27.8499 108 0.02 97
IV.ASQU.HHZ. 2021-11-09T07:21:15.64 0.1 undecidable manual P 175 23.5542 111 -0.04 98
IV.BRIS.HHZ. 2021-11-09T07:21:15.92 0.1 undecidable manual P 0 23.9538 110 0.16 96
IV.LMD.HHZ. 2021-11-09T07:21:14.52 0.3 undecidable manual S 329 8.9799 135 -0.48 69
IV.SFI.EHZ. 2021-11-09T07:21:13.80 0.1 undecidable manual P 150 13.1757 124 -0.02 100
IV.LMD.HHZ. 2021-11-09T07:21:12.93 0.3 undecidable manual P 329 8.9799 135 -0.23 72
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SFI.HNN. ML:1.6 0.00040248445 0.3808 AML other m 2021-11-09T07:21:16.26
IV.SFI.EHN. ML:1.5 0.00034972409999999997 0.3616 AML other m 2021-11-09T07:21:16.44
IV.SFI.HNE. ML:1.5 0.0003454439 0.1216 AML other m 2021-11-09T07:21:16.35
IV.SFI.EHE. ML:1.5 0.00035586375000000003 0.1216 AML other m 2021-11-09T07:21:16.35
IV.ASQU.HHE. ML:1.7 0.00033812655 0.2016 AML other m 2021-11-09T07:21:19.89
IV.ASQU.HHN. ML:1.4 0.00016615985 0.2016 AML other m 2021-11-09T07:21:19.97
IV.BRIS.HHE. ML:1.7 0.000324 0.3 AML other m 2021-11-09T07:21:20.37
IV.BRIS.HHN. ML:2.1 0.000776 0.24 AML other m 2021-11-09T07:21:20.49
IV.RUFI.EHE. ML:1.2 0.00007852844 0.6592 AML other m 2021-11-09T07:21:20.96
IV.RUFI.EHN. ML:1.4 0.00013100295000000002 0.24 AML other m 2021-11-09T07:21:21.48
IV.VISG.HHE. ML:0.9 0.000036651292499999995 0.1216 AML other m 2021-11-09T07:21:22.87
IV.VISG.HHN. ML:1.1 0.000055184819999999995 0.3584 AML other m 2021-11-09T07:21:22.97
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