Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.3 on date 15-10-2021 and time 09:12:20 (Italy) in region 5 km W Tredozio (FC)

A magnitude ML 1.3 earthquake occured in region: 5 km W Tredozio (FC), on

  • 15-10-2021 07:12:20 (UTC)
  • 15-10-2021 09:12:20 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.0700, 11.6850 at 7 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
Tredozio FC 5 1212 1212
Marradi FI 6 3139 4351
Portico e San Benedetto FC 9 756 5107
Palazzuolo sul Senio FI 12 1154 6261
Premilcuore FC 13 799 7060
Rocca San Casciano FC 13 1910 8970
Modigliana FC 13 4560 13530
San Godenzo FI 17 1167 14697
Dovadola FC 17 1653 16350
Casola Valsenio RA 18 2617 18967
Brisighella RA 18 7639 26606
Galeata FC 20 2516 29122

Municipalities with at least 50000 inhabitants

An earthquake occurred to
29 Km SW of Faenza (58541 inhabitants)
32 Km S of Imola (69797 inhabitants)
33 Km SW of Forlì (117913 inhabitants)
45 Km W of Cesena (96758 inhabitants)
48 Km NE of Firenze (382808 inhabitants)
51 Km E of Prato (191150 inhabitants)
53 Km NE of Scandicci (50609 inhabitants)
55 Km SE of Bologna (386663 inhabitants)
57 Km SW of Ravenna (159116 inhabitants)
63 Km E of Pistoia (90315 inhabitants)
69 Km N of Arezzo (99543 inhabitants)
71 Km W of Rimini (147750 inhabitants)
86 Km S of Ferrara (133155 inhabitants)
88 Km SE of Modena (184973 inhabitants)
88 Km NE of Siena (53903 inhabitants)
98 Km E of Lucca (89046 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 1.3 2021-10-15
07:12:20		 44.0697 11.6847 7 2022-03-30
13:04:26		 Bollettino Sismico Italiano INGV 99285161
Reviewed
Rev100 		ML 1.5 2021-10-15
07:12:20		 44.0703 11.6875 7 2021-10-15
07:35:51		 Sala Sismica INGV-Roma 96599291
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-15 07:12:20 ± 0.08
Latitude 44.0697 ± 0.0036
Longitude 11.6847 ± 0.0050
Depth (km) 7 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 99285161

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 396
Semi-minor axis of confidence ellipse (meter) 217
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 254
Circular confidence region, given by single value of horizontal uncertainty (meter) 400.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 81
Number of associated phases, regardless of their use for origin computation 18
Number of defining phases 16
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.2
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.49013
Number of stations at which the event was observed 10
Number of stations from which data was used for origin computation 8
Magnitudes information

ML:1.5

Field Value
Value 1.5
Uncertainty 0.4
Num. used stations 12
Type of magnitude ML
Reference to an origin 96599291
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-15 07:35:51

ML:1.3

Field Value
Value 1.3
Uncertainty 0.3
Num. used stations 14
Type of magnitude ML
Reference to an origin 99285161
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2022-02-11 17:19:54
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CRE.HHE. 2021-10-15T07:12:38.77 0.3 undecidable manual S 157 54.4011 50 0.31 65
GU.GSCL.HHZ. 2021-10-15T07:12:37.33 3.0 negative manual P 0.03 0
IV.RUFI.EHZ. 2021-10-15T07:12:31.09 0.3 undecidable manual S 209 29.2485 103 0.11 71
IV.ASQU.HHZ. 2021-10-15T07:12:31.75 0.6 undecidable manual S 165 31.4463 102 0.04 48
IV.CRE.HHE. 2021-10-15T07:12:30.40 0.3 undecidable manual P 157 54.4011 50 -0.49 62
IV.SEI.HHZ. 2021-10-15T07:12:30.26 0.6 undecidable manual S 266 26.0517 105 0.36 45
IV.VISG.HHZ. 2021-10-15T07:12:29.27 0.3 undecidable manual S 304 23.9538 106 0.08 72
IV.FIR.HHZ. 2021-10-15T07:12:29.70 3.0 undecidable manual P -0.19 0
IV.SFI.EHZ. 2021-10-15T07:12:28.99 0.3 undecidable manual S 145 22.4553 107 0.3 69
IV.BRIS.HHZ. 2021-10-15T07:12:27.57 0.3 undecidable manual S 21 18.3705 111 0.21 71
IV.ASQU.HHZ. 2021-10-15T07:12:26.74 0.1 undecidable manual P 165 31.4463 102 -0.25 91
IV.RUFI.EHZ. 2021-10-15T07:12:26.52 0.3 undecidable manual P 209 29.2485 103 -0.05 72
IV.SEI.HHZ. 2021-10-15T07:12:25.84 0.1 undecidable manual P 266 26.0517 105 -0.11 95
IV.SFI.EHZ. 2021-10-15T07:12:25.25 0.1 undecidable manual P 145 22.4553 107 0 98
IV.VISG.HHZ. 2021-10-15T07:12:25.42 0.1 positive manual P 304 23.9538 106 -0.12 95
IV.BRIS.HHZ. 2021-10-15T07:12:24.53 0.1 undecidable manual P 21 18.3705 111 0.05 97
IV.LMD.HHE. 2021-10-15T07:12:22.91 0.3 undecidable manual S 64 1.998 164 -0.12 74
IV.LMD.HHE. 2021-10-15T07:12:21.93 0.1 undecidable manual P 64 1.998 164 -0.06 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.BRIS.HHE. ML:2.0 0.000975 0.14 AML other m 2021-10-15T07:12:27.83
IV.BRIS.HHN. ML:2.3 0.001865 1.78 AML other m 2021-10-15T07:12:28.89
IV.SFI.HNN. ML:1.3 0.000131722075 0.1504 AML other m 2021-10-15T07:12:29.21
IV.SFI.EHN. ML:1.3 0.00012888089999999998 0.1408 AML other m 2021-10-15T07:12:29.14
IV.VISG.HHN. ML:1.4 0.000148644 0.1408 AML other m 2021-10-15T07:12:29.51
IV.SFI.HNE. ML:1.4 0.00018726749999999998 0.3616 AML other m 2021-10-15T07:12:29.31
IV.VISG.HHE. ML:1.1 0.000090462465 0.16 AML other m 2021-10-15T07:12:29.54
IV.SFI.EHE. ML:1.1 0.00009547322999999999 0.1824 AML other m 2021-10-15T07:12:30.95
IV.RUFI.EHE. ML:1.2 0.00009039087500000001 0.3968 AML other m 2021-10-15T07:12:31.31
IV.RUFI.EHN. ML:1.2 0.00008579047499999999 0.1824 AML other m 2021-10-15T07:12:31.64
IV.ASQU.HHN. ML:1.0 0.00005 0.18 AML other m 2021-10-15T07:12:32.06
IV.ASQU.HHE. ML:0.9 0.000040258705 0.1984 AML other m 2021-10-15T07:12:32.09
IV.SEI.HHN. ML:1.6 0.00024516035 0.3392 AML other m 2021-10-15T07:12:32.82
IV.SEI.HHE. ML:1.5 0.00017999999999999998 0.4 AML other m 2021-10-15T07:12:34.75
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