Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.3 on date 15-09-2021 and time 09:27:11 (Italy) in region 5 km NW Forlì (FC)

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

  • 15-09-2021 07:27:11 (UTC)
  • 15-09-2021 09:27:11 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.2550, 12.0060 at 24 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
Forlì FC 5 117913 117913
Castrocaro Terme e Terra del Sole FC 10 6426 124339
Faenza RA 10 58541 182880
Forlimpopoli FC 12 13290 196170
Russi RA 13 12247 208417
Meldola FC 15 9970 218387
Cotignola RA 15 7474 225861
Bertinoro FC 16 11059 236920
Predappio FC 17 6346 243266
Solarolo RA 17 4488 247754
Dovadola FC 18 1653 249407
Castel Bolognese RA 18 9554 258961
Bagnacavallo RA 18 16739 275700
Brisighella RA 19 7639 283339
Lugo RA 20 32390 315729

Municipalities with at least 50000 inhabitants

An earthquake occurred to
5 Km NW of Forlì (117913 inhabitants)
10 Km E of Faenza (58541 inhabitants)
23 Km NW of Cesena (96758 inhabitants)
24 Km SW of Ravenna (159116 inhabitants)
26 Km E of Imola (69797 inhabitants)
50 Km W of Rimini (147750 inhabitants)
59 Km E of Bologna (386663 inhabitants)
72 Km SE of Ferrara (133155 inhabitants)
81 Km NE of Firenze (382808 inhabitants)
82 Km W of Pesaro (94582 inhabitants)
84 Km E of Prato (191150 inhabitants)
86 Km NE of Scandicci (50609 inhabitants)
88 Km N of Arezzo (99543 inhabitants)
92 Km S of Rovigo (51867 inhabitants)
93 Km W of Fano (60888 inhabitants)
94 Km E of Pistoia (90315 inhabitants)
96 Km E 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 1.3 2021-09-15
07:27:11		 44.2553 12.0062 24 2021-09-15
07:37:11		 Sala Sismica INGV-Roma 95454341
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-15 07:27:11 ± 0.25
Latitude 44.2553 ± 0.0108
Longitude 12.0062 ± 0.0188
Depth (km) 24 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 95454341

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1419
Semi-minor axis of confidence ellipse (meter) 626
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 109
Circular confidence region, given by single value of horizontal uncertainty (meter) 1420.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 137
Number of associated phases, regardless of their use for origin computation 39
Number of defining phases 14
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.35
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.50542
Number of stations at which the event was observed 33
Number of stations from which data was used for origin computation 8
Magnitude information

ML:1.3

Field Value
Value 1.3
Uncertainty 0.2
Num. used stations 10
Type of magnitude ML
Reference to an origin 95454341
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-15 07:37:11
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.IFOR.HHZ. 2021-09-15T07:29:08.92 3.0 undecidable manual Sg 3.22 0
IX.NSC3.EHZ.02 2021-09-15T07:29:04.36 3.0 undecidable manual Sn -9.99 0
IV.SERS.HHZ. 2021-09-15T07:29:04.26 3.0 undecidable manual Pg 11.28 0
IV.ACATE.EHZ. 2021-09-15T07:29:01.35 3.0 undecidable manual Pn -6.41 0
IV.MRB1.HHZ. 2021-09-15T07:29:00.45 3.0 undecidable manual Sn -7.5 0
IV.CLTA.HHZ. 2021-09-15T07:28:57.06 3.0 undecidable manual Pn -7.38 0
MN.PDG.HHZ. 2021-09-15T07:28:56.73 3.0 negative manual Pg 11.36 0
IV.CERA.HHZ. 2021-09-15T07:28:53.28 3.0 undecidable manual Sg 5 0
CR.ZAG.BHZ. 2021-09-15T07:28:53.36 3.0 undecidable manual Sn -2.91 0
IV.ORI.HHZ. 2021-09-15T07:28:46.96 3.0 undecidable manual Pg 6.62 0
GU.MGRO.HHZ. 2021-09-15T07:28:40.14 3.0 undecidable manual Sg 3.98 0
IV.RCAV.EHZ. 2021-09-15T07:28:21.04 3.0 undecidable manual Sn -9.99 0
IV.VBKN.HHZ. 2021-09-15T07:28:20.73 3.0 positive manual Pg 1.44 0
IV.PTRJ.HNZ. 2021-09-15T07:28:19.16 3.0 undecidable manual Pg 5.4 0
IV.RM33.EHZ. 2021-09-15T07:28:15.39 3.0 undecidable manual Sg -6.28 0
IV.OVO.HHZ. 2021-09-15T07:28:10.25 3.0 positive manual Pn -8.89 0
IV.SGG.HHZ. 2021-09-15T07:28:06.47 3.0 positive manual Pn -6.13 0
IV.VOBA.EHZ. 2021-09-15T07:28:00.04 3.0 undecidable manual Sn -8.99 0
IV.RDP.HHZ. 2021-09-15T07:27:50.09 3.0 positive manual Pn -9.99 0
IV.MMUR.HNZ. 2021-09-15T07:27:50.20 3.0 undecidable manual S -9.99 0
IV.BAG8.EHZ. 2021-09-15T07:27:44.72 3.0 positive manual Pn -3.7 0
IV.ATPI.EHZ. 2021-09-15T07:27:44.88 3.0 undecidable manual S -8.5 0
IV.COR1.EHZ. 2021-09-15T07:27:38.12 3.0 undecidable manual P -2.67 0
IV.NDIM.HHZ. 2021-09-15T07:27:30.78 3.0 negative manual P -2.87 0
IV.SEI.HHZ. 2021-09-15T07:27:29.57 0.3 undecidable manual S 247 56.0994 106 0.46 65
IV.ASQU.HHZ. 2021-09-15T07:27:28.45 0.3 undecidable manual S 199 53.7018 107 -0.04 70
IV.VISG.HHZ. 2021-09-15T07:27:26.93 0.6 undecidable manual S 261 46.0206 110 0.38 45
IV.SFI.EHZ. 2021-09-15T07:27:25.19 0.6 undecidable manual S 198 40.9257 113 -0.08 48
IV.FIR.HHZ. 2021-09-15T07:27:22.87 3.0 undecidable manual P -5 0
IV.LMD.HHZ. 2021-09-15T07:27:22.28 0.6 undecidable manual S 230 30.8469 121 -0.61 42
IV.ASQU.HHZ. 2021-09-15T07:27:21.09 0.1 undecidable manual P 199 53.7018 107 -0.08 94
IV.SEI.HHZ. 2021-09-15T07:27:21.65 1.0 negative manual P 247 56.0994 106 0.12 23
IV.BRIS.HNZ. 2021-09-15T07:27:20.40 0.3 undecidable manual S 260 19.3695 136 -0.07 75
IV.VISG.HHZ. 2021-09-15T07:27:20.03 0.1 undecidable manual P 261 46.0206 110 -0.02 97
IV.SFI.EHZ. 2021-09-15T07:27:19.15 0.1 undecidable manual P 198 40.9257 113 -0.16 94
IV.CMPO.HNE. 2021-09-15T07:27:18.56 0.1 undecidable manual P 336 39.4272 114 -0.55 88
IV.LMD.HHZ. 2021-09-15T07:27:17.60 0.6 positive manual P 230 30.8469 121 -0.34 46
IV.BRSN.HNE. 2021-09-15T07:27:16.38 0.1 undecidable manual P 61 6.6933 162 0.85 80
IV.BRIS.HNZ. 2021-09-15T07:27:16.61 0.1 undecidable manual P 260 19.3695 136 0.07 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.LMD.HHN. ML:1.7 0.000169 0.3 AML other m 2021-09-15T07:27:22.81
IV.LMD.HHE. ML:1.5 0.0001205 0.28 AML other m 2021-09-15T07:27:22.69
IV.SFI.EHN. ML:1.2 0.000048 0.98 AML other m 2021-09-15T07:27:25.22
IV.SFI.EHE. ML:1.2 0.000047850000000000004 1.6 AML other m 2021-09-15T07:27:26.06
IV.ASQU.HHE. ML:1.1 0.0000295 1.56 AML other m 2021-09-15T07:27:29.88
IV.SEI.HHN. ML:1.5 0.00006505 1.46 AML other m 2021-09-15T07:27:30.82
IV.ASQU.HHN. ML:1.1 0.000027049999999999997 0.22 AML other m 2021-09-15T07:27:30.82
IV.SEI.HHE. ML:1.4 0.00004985 0.4 AML other m 2021-09-15T07:27:31.26
IV.VISG.HHE. ML:1.0 0.000024017495 0.2368 AML other m 2021-09-15T07:27:28.19
IV.VISG.HHN. ML:1.1 0.00003283701 0.1984 AML other m 2021-09-15T07:27:28.30
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