Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.8 on date 30-09-2021 and time 13:31:35 (Italy) in region 1 km W Forlimpopoli (FC)

A magnitude ML 1.8 earthquake occured in region: 1 km W Forlimpopoli (FC), on

  • 30-09-2021 11:31:35 (UTC)
  • 30-09-2021 13:31:35 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.1900, 12.1150 at 36 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
Forlimpopoli FC 1 13290 13290
Bertinoro FC 5 11059 24349
Forlì FC 7 117913 142262
Meldola FC 8 9970 152232
Cesena FC 12 96758 248990
Castrocaro Terme e Terra del Sole FC 13 6426 255416
Predappio FC 14 6346 261762
Montiano FC 19 1716 263478
Gambettola FC 20 10660 274138
Dovadola FC 20 1653 275791

Municipalities with at least 50000 inhabitants

An earthquake occurred to
7 Km SE of Forlì (117913 inhabitants)
12 Km W of Cesena (96758 inhabitants)
21 Km SE of Faenza (58541 inhabitants)
26 Km S of Ravenna (159116 inhabitants)
37 Km E of Imola (69797 inhabitants)
39 Km W of Rimini (147750 inhabitants)
70 Km E of Bologna (386663 inhabitants)
71 Km W of Pesaro (94582 inhabitants)
82 Km W of Fano (60888 inhabitants)
82 Km SE of Ferrara (133155 inhabitants)
83 Km N of Arezzo (99543 inhabitants)
83 Km NE of Firenze (382808 inhabitants)
88 Km E of Prato (191150 inhabitants)
89 Km NE of Scandicci (50609 inhabitants)
100 Km E of Pistoia (90315 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 1.8 2021-09-30
11:31:35		 44.1898 12.1152 36 2022-03-30
13:04:11		 Bollettino Sismico Italiano INGV 96540991
Reviewed
Rev100 		ML 1.9 2021-09-30
11:31:35		 44.2398 12.2037 30 2021-09-30
11:43:00		 Sala Sismica INGV-Roma 96062591
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-30 11:31:35 ± 0.08
Latitude 44.1898 ± 0.0045
Longitude 12.1152 ± 0.0050
Depth (km) 36 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 96540991

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 426
Semi-minor axis of confidence ellipse (meter) 382
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 215
Circular confidence region, given by single value of horizontal uncertainty (meter) 430.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 191
Number of associated phases, regardless of their use for origin computation 67
Number of defining phases 37
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) 1.10796
Number of stations at which the event was observed 51
Number of stations from which data was used for origin computation 21
Magnitudes information

ML:1.8

Field Value
Value 1.8
Uncertainty 0.2
Num. used stations 10
Type of magnitude ML
Reference to an origin 96540991
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-10-14 10:28:44

ML:1.9

Field Value
Value 1.9
Uncertainty 0.1
Num. used stations 6
Type of magnitude ML
Reference to an origin 96062591
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-30 11:43:00
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
MN.PDG.HHZ. 2021-09-30T11:32:43.77 3.0 undecidable manual Pg 20.870001 0
MN.BNI.HHZ. 2021-09-30T11:32:37.61 3.0 undecidable manual Sn 10.24 0
IX.SCL3.EHZ.02 2021-09-30T11:32:36.17 3.0 undecidable manual Sn -9.99 0
IV.VITU.HHZ. 2021-09-30T11:32:35.28 3.0 undecidable manual Sg 7.49 0
IV.MILZ.HHZ. 2021-09-30T11:32:35.04 3.0 positive manual Pg 16.42 0
IV.RESU.HHZ. 2021-09-30T11:32:33.35 3.0 undecidable manual Pg 13.22 0
IX.MNT3.EHZ.02 2021-09-30T11:32:32.33 3.0 undecidable manual Sn -5.68 0
IV.VBKN.HHZ. 2021-09-30T11:32:26.80 3.0 undecidable manual Sn -3.49 0
IV.SERS.HHZ. 2021-09-30T11:32:23.30 3.0 positive manual Pn 2.93 0
MN.TRI.HHZ. 2021-09-30T11:32:23.97 3.0 undecidable manual Sn 1.14 0
CR.STON.BHZ. 2021-09-30T11:32:21.26 3.0 undecidable manual Pg 14.65 0
IV.MCEL.HHZ. 2021-09-30T11:32:17.61 3.0 negative manual Pg 15.73 0
IV.ZEN8.EHZ. 2021-09-30T11:32:16.75 3.0 undecidable manual Sg 13.38 0
IV.SCHR.EHZ. 2021-09-30T11:32:16.28 3.0 positive manual Pg 11.16 0
IV.MTSN.HHZ. 2021-09-30T11:32:12.22 3.0 undecidable manual Pg 10.24 0
SL.KOGS.BHZ. 2021-09-30T11:32:08.02 3.0 undecidable manual Pn 1.71 0
IV.VVLD.HHZ. 2021-09-30T11:32:06.27 3.0 undecidable manual Sg 1.62 0
IV.ERC.EHZ. 2021-09-30T11:32:03.29 3.0 undecidable manual Pn -6.76 0
IV.TREG.HNZ. 2021-09-30T11:32:03.24 3.0 undecidable manual Sn 2.04 0
IV.MPAG.EHZ. 2021-09-30T11:32:01.04 0.3 undecidable manual S 140 80.7636 54 0.01 70
IV.PIEI.HHZ. 2021-09-30T11:32:00.74 0.6 undecidable manual S 155 79.9644 54 -0.12 46
IV.NARO.HHZ. 2021-09-30T11:31:59.76 0.3 undecidable manual S 150 74.2701 111 0.28 67
IV.PE3.EHZ. 2021-09-30T11:31:57.00 0.3 undecidable manual S 151 62.6928 115 0.35 68
IV.SACR.HHZ. 2021-09-30T11:31:57.53 3.0 undecidable manual Pg 12.94 0
IV.CRE.HHE. 2021-09-30T11:31:57.32 0.3 undecidable manual S 192 64.6908 114 0.19 70
IV.SARZ.HHZ. 2021-09-30T11:31:57.12 3.0 undecidable manual Sn 0.12 0
IV.PESA.HHE. 2021-09-30T11:31:57.37 0.6 undecidable manual S 115 64.0914 115 0.39 44
IV.RUFI.EHE. 2021-09-30T11:31:56.65 0.3 undecidable manual S 231 62.0934 115 0.14 71
IV.SEI.HHZ. 2021-09-30T11:31:56.56 0.6 undecidable manual S 256 62.0934 115 0.05 48
IV.VISG.HHZ. 2021-09-30T11:31:55.01 0.3 undecidable manual S 270 54.1014 119 0.39 68
IV.PARC.HHE. 2021-09-30T11:31:55.94 0.6 undecidable manual S 171 60.7947 116 -0.27 46
IV.SNTG.HHZ. 2021-09-30T11:31:55.63 0.6 undecidable manual P 147 122.988 54 -0.08 43
IV.ASQU.HHE. 2021-09-30T11:31:53.88 0.6 undecidable manual S 211 50.8158 121 0.04 50
IV.ARVD.HHZ. 2021-09-30T11:31:52.84 0.6 undecidable manual P 139 101.3208 54 -0.17 44
IV.CPGN.EHZ. 2021-09-30T11:31:52.79 0.6 undecidable manual S 159 46.1205 123 0 50
IV.RSM2.HHE. 2021-09-30T11:31:51.12 0.6 undecidable manual S 137 38.4282 129 0 50
IV.CRTC.HNE. 2021-09-30T11:31:50.11 0.6 undecidable manual P 127 77.0673 110 0.14 46
IV.SFI.EHZ. 2021-09-30T11:31:50.82 0.6 undecidable manual S 214 38.1285 129 -0.25 48
IV.MPAG.EHZ. 2021-09-30T11:31:50.41 0.1 undecidable manual P 140 80.7636 54 -0.04 93
IV.PIEI.HHZ. 2021-09-30T11:31:50.03 0.1 undecidable manual P 155 79.9644 54 -0.32 88
GU.RNCA.HHZ. 2021-09-30T11:31:50.89 3.0 undecidable manual Sn 0.35 0
IV.LMD.HHZ. 2021-09-30T11:31:50.13 0.3 undecidable manual S 249 34.743 132 -0.26 73
IV.NARO.HHZ. 2021-09-30T11:31:49.58 0.6 undecidable manual P 150 74.2701 111 0.02 47
IV.BRIS.HHZ. 2021-09-30T11:31:49.00 0.3 undecidable manual S 278 27.9498 139 -0.11 77
IV.BOSL.HHE. 2021-09-30T11:31:48.52 0.6 undecidable manual P 244 65.6898 114 0.18 46
IV.RUFI.EHE. 2021-09-30T11:31:48.20 0.1 undecidable manual P 231 62.0934 115 0.36 90
IV.PESA.HHE. 2021-09-30T11:31:48.34 0.6 undecidable manual P 115 64.0914 115 0.23 46
IV.SEI.HHZ. 2021-09-30T11:31:47.97 0.6 undecidable manual P 256 62.0934 115 0.13 47
IV.PARC.HHE. 2021-09-30T11:31:47.69 0.1 undecidable manual P 171 60.7947 116 0.03 97
IV.PE3.EHZ. 2021-09-30T11:31:47.80 0.6 undecidable manual P 151 62.6928 115 -0.12 48
IV.VISG.HHZ. 2021-09-30T11:31:47.13 0.6 undecidable manual P 270 54.1014 119 0.38 45
IV.MTRZ.HNN. 2021-09-30T11:31:47.34 0.1 undecidable manual P 284 56.499 118 0.27 92
IV.CRE.HHE. 2021-09-30T11:31:47.97 0.1 undecidable manual P 192 64.6908 114 -0.23 92
IV.ASQU.HHE. 2021-09-30T11:31:46.01 0.1 undecidable manual P 211 50.8158 121 -0.28 94
IV.CPGN.EHZ. 2021-09-30T11:31:45.70 0.3 undecidable manual P 159 46.1205 123 0.01 100
IX.RSF3.HHZ.02 2021-09-30T11:31:44.27 3.0 undecidable manual Pn -7.39 0
IV.SFI.EHZ. 2021-09-30T11:31:44.24 0.1 undecidable manual P 214 38.1285 129 -0.46 92
IV.RSM2.HHE. 2021-09-30T11:31:44.84 0.3 undecidable manual P 137 38.4282 129 0.12 74
IV.BRIS.HHZ. 2021-09-30T11:31:43.35 0.1 undecidable manual P 278 27.9498 139 -0.21 100
IV.LMD.HHZ. 2021-09-30T11:31:43.99 0.3 undecidable manual P 249 34.743 132 -0.31 72
GU.POPM.HHZ. 2021-09-30T11:31:41.04 3.0 undecidable manual Sg 8.28 0
IT.PLTA.HNZ. 2021-09-30T11:31:40.40 3.0 undecidable manual Pn -1.79 0
IV.PCN.HNZ. 2021-09-30T11:31:32.82 3.0 negative manual Pg 6.43 0
FR.AJAC.HHZ.00 2021-09-30T11:31:26.30 3.0 positive manual Pn 0.1 0
IV.NDIM.HNZ. 2021-09-30T11:31:23.87 3.0 negative manual Pn 0.92 0
IT.RMMM.HGZ. 2021-09-30T11:31:19.89 3.0 positive manual P -4.16 0
IV.RIBO.EHZ.01 2021-09-30T11:31:10.00 3.0 positive manual Pn -1.66 0
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.LMD.HHE. ML:2.0 0.00029749999999999997 0.18 AML other m 2021-09-30T11:31:51.79
IV.LMD.HHN. ML:2.0 0.00027800000000000004 1.82 AML other m 2021-09-30T11:31:52.99
IV.SFI.EHN. ML:1.8 0.00014850000000000003 1.4 AML other m 2021-09-30T11:31:52.19
IV.SFI.EHE. ML:1.8 0.0001605 0.52 AML other m 2021-09-30T11:31:52.52
IV.CPGN.EHN. ML:1.8 0.0001525 1.08 AML other m 2021-09-30T11:31:56.08
IV.CPGN.EHE. ML:1.9 0.0001805 0.42 AML other m 2021-09-30T11:32:01.47
IV.PIEI.HHN. ML:1.5 0.000039 0.6 AML other m 2021-09-30T11:32:03.56
IV.PIEI.HHE. ML:1.6 0.00005545 0.34 AML other m 2021-09-30T11:32:03.72
IV.MPAG.EHN. ML:1.9 0.00009165 0.42 AML other m 2021-09-30T11:32:04.54
IV.MPAG.EHE. ML:1.8 0.00007439999999999999 0.42 AML other m 2021-09-30T11:32:11.67
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