Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.7 on date 04-09-2020 and time 23:29:31 (UTC) in region 4 km E Castrocaro Terme e Terra del Sole (FC)

A magnitude ML 1.7 earthquake occured in region: 4 km E Castrocaro Terme e Terra del Sole (FC), on

  • 04-09-2020 23:29:31 (UTC)
  • 05-09-2020 01:29:31 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.1770, 11.9970 at 28 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
Castrocaro Terme e Terra del Sole FC 4 6426 6426
Forlì FC 6 117913 124339
Meldola FC 8 9970 134309
Predappio FC 8 6346 140655
Forlimpopoli FC 11 13290 153945
Dovadola FC 11 1653 155598
Bertinoro FC 12 11059 166657
Faenza RA 15 58541 225198
Modigliana FC 16 4560 229758
Rocca San Casciano FC 18 1910 231668
Brisighella RA 19 7639 239307
Civitella di Romagna FC 19 3786 243093

Municipalities with at least 50000 inhabitants

An earthquake occurred to
6 Km SW of Forlì (117913 inhabitants)
15 Km SE of Faenza (58541 inhabitants)
20 Km W of Cesena (96758 inhabitants)
30 Km SE of Imola (69797 inhabitants)
31 Km SW of Ravenna (159116 inhabitants)
47 Km W of Rimini (147750 inhabitants)
63 Km SE of Bologna (386663 inhabitants)
75 Km NE of Firenze (382808 inhabitants)
79 Km E of Prato (191150 inhabitants)
79 Km W of Pesaro (94582 inhabitants)
79 Km SE of Ferrara (133155 inhabitants)
80 Km N of Arezzo (99543 inhabitants)
80 Km NE of Scandicci (50609 inhabitants)
90 Km W of Fano (60888 inhabitants)
90 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 1.7 2020-09-04
23:29:31		 44.1773 11.9967 28 2021-02-26
14:56:05		 Bollettino Sismico Italiano INGV 84692371
Reviewed
Rev100 		ML 1.8 2020-09-04
23:29:30		 44.1987 11.9478 35 2020-09-04
23:53:32		 Sala Sismica INGV-Roma 82631241
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-09-04 23:29:31 ± 0.27
Latitude 44.1773 ± 0.0099
Longitude 11.9967 ± 0.0113
Depth (km) 28 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 84692371

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1013
Semi-minor axis of confidence ellipse (meter) 646
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 220
Circular confidence region, given by single value of horizontal uncertainty (meter) 1010.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 67
Number of associated phases, regardless of their use for origin computation 46
Number of defining phases 37
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.54
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.75723
Number of stations at which the event was observed 27
Number of stations from which data was used for origin computation 20
Magnitudes information

ML:1.8

Field Value
Value 1.8
Uncertainty 0.3
Num. used stations 12
Type of magnitude ML
Reference to an origin 82631241
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-09-04 23:53:32

ML:1.7

Field Value
Value 1.7
Uncertainty 0.3
Num. used stations 12
Type of magnitude ML
Reference to an origin 84692371
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2020-11-23 11:21:15
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
XK.SELL.HHZ. 2020-09-04T23:31:00.99 3.0 positive manual Pn 2.58 0
IV.PTRJ.HNZ. 2020-09-04T23:30:56.61 3.0 undecidable manual Sn -1.59 0
IV.MILN.HHZ. 2020-09-04T23:30:33.33 3.0 undecidable manual Sn 0.15 0
IV.ROSPO.HHZ. 2020-09-04T23:30:15.20 3.0 positive manual Pn 1.49 0
IV.OFFI.HHZ. 2020-09-04T23:30:04.31 3.0 undecidable manual S 0
IV.OFFI.HHZ. 2020-09-04T23:30:00.93 3.0 undecidable manual P 0
GU.RNCA.HHZ. 2020-09-04T23:30:00.37 3.0 undecidable manual Pn -0.91 0
IV.NARO.HHZ. 2020-09-04T23:29:56.02 0.3 undecidable manual S 143 78.2661 105 0.82 58
IV.PESA.HHZ. 2020-09-04T23:29:54.65 0.3 undecidable manual S 111 72.1722 106 1.02 55
IV.EL6.EHZ. 2020-09-04T23:29:53.25 3.0 undecidable manual S 0
IV.PE3.EHZ. 2020-09-04T23:29:53.28 0.3 undecidable manual S 143 66.6777 107 1.06 54
IV.PARC.HHZ. 2020-09-04T23:29:51.27 0.3 undecidable manual S 162 61.7937 109 0.3 70
IV.CPGN.EHZ. 2020-09-04T23:29:49.49 0.3 undecidable manual S 148 49.1175 114 1.66 40
IV.SEI.HHZ. 2020-09-04T23:29:49.94 0.6 undecidable manual S 255 52.6029 113 1.24 32
IV.RUFI.EHZ. 2020-09-04T23:29:49.43 0.6 undecidable manual S 226 54.1014 112 0.37 46
IV.VISG.HHZ. 2020-09-04T23:29:47.82 0.6 undecidable manual S 272 44.7219 117 1.04 36
IV.ASQU.HHZ. 2020-09-04T23:29:46.72 0.6 undecidable manual S 201 45.3213 116 -0.21 49
IV.RINC.HHZ. 2020-09-04T23:29:46.96 0.3 undecidable manual S 224 44.8218 117 0.17 73
IV.CRTC.HHZ. 2020-09-04T23:29:46.55 0.6 undecidable manual P 122 84.0492 103 0.6 42
IV.IMOL.HNZ. 2020-09-04T23:29:45.09 0.6 undecidable manual S 315 28.5492 130 1.94 21
IV.BLLA.EHE. 2020-09-04T23:29:45.24 0.6 undecidable manual S 96 37.8288 121 0.06 51
IV.NARO.HHZ. 2020-09-04T23:29:44.61 0.1 undecidable manual P 143 78.2661 105 -0.47 86
IV.PESA.HHZ. 2020-09-04T23:29:44.59 0.3 undecidable manual P 111 72.1722 106 0.42 68
IV.PE3.EHZ. 2020-09-04T23:29:43.06 0.1 undecidable manual P 143 66.6777 107 -0.3 91
IV.EL6.EHZ. 2020-09-04T23:29:43.80 3.0 undecidable manual P 0
IV.PARC.HHZ. 2020-09-04T23:29:42.20 0.1 undecidable manual P 162 61.7937 109 -0.44 90
IV.SFI.HNN. 2020-09-04T23:29:42.95 0.6 undecidable manual S 202 32.5452 126 -1.03 38
IV.MTRZ.HNN. 2020-09-04T23:29:41.77 0.3 undecidable manual P 289 47.9187 115 1.12 52
IT.FAZ.HNZ. 2020-09-04T23:29:41.67 0.6 undecidable manual S 328 15.7731 148 0.78 43
IV.RUFI.EHZ. 2020-09-04T23:29:41.13 0.1 undecidable manual P 226 54.1014 112 -0.41 93
IV.FAEN.HNN. 2020-09-04T23:29:41.32 0.3 undecidable manual S 323 15.6732 148 0.45 73
IV.SEI.HHZ. 2020-09-04T23:29:41.35 0.1 undecidable manual P 255 52.6029 113 0.03 100
IV.VISG.HHZ. 2020-09-04T23:29:40.14 0.3 undecidable manual P 272 44.7219 117 -0.08 76
IV.BRIS.HNZ. 2020-09-04T23:29:40.88 0.3 undecidable manual S 286 19.0698 143 -0.5 73
IV.RSM2.HHE. 2020-09-04T23:29:40.12 0.3 undecidable manual P 126 44.5221 117 -0.08 75
IV.CPGN.EHZ. 2020-09-04T23:29:40.93 0.1 undecidable manual P 148 49.1175 114 0.1 100
IV.ASQU.HHZ. 2020-09-04T23:29:39.57 0.1 negative manual P 201 45.3213 116 -0.73 84
IV.BRSN.HNE. 2020-09-04T23:29:39.77 0.6 undecidable manual S 29 13.5753 152 -0.82 42
IV.RINC.HHZ. 2020-09-04T23:29:39.75 0.1 negative manual P 224 44.8218 117 -0.48 93
IV.IMOL.HNZ. 2020-09-04T23:29:38.99 0.1 undecidable manual P 315 28.5492 130 0.87 82
IV.BLLA.EHE. 2020-09-04T23:29:38.80 0.1 undecidable manual P 96 37.8288 121 -0.5 91
IV.SFI.HNN. 2020-09-04T23:29:37.67 0.1 undecidable manual P 202 32.5452 126 -0.93 79
IV.FAEN.HNN. 2020-09-04T23:29:36.68 0.3 undecidable manual P 323 15.6732 148 -0.13 78
IV.BRIS.HNZ. 2020-09-04T23:29:36.60 0.1 negative manual P 286 19.0698 143 -0.5 96
IT.FAZ.HNZ. 2020-09-04T23:29:36.70 0.3 undecidable manual P 328 15.7731 148 -0.12 79
IV.BRSN.HNE. 2020-09-04T23:29:35.59 0.1 undecidable manual P 29 13.5753 152 -1.05 75
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CPGN.EHN. ML:1.5 0.0000747 0.22 AML other m 2020-09-04T23:29:50.13
IV.SEI.HHN. ML:2.2 0.0003395 0.62 AML other m 2020-09-04T23:29:50.95
IV.CPGN.EHE. ML:1.6 0.0000785 0.26 AML other m 2020-09-04T23:29:50.86
IV.PARC.HHN. ML:1.4 0.00005025 1.64 AML other m 2020-09-04T23:29:51.84
IV.PARC.HHE. ML:1.3 0.00003535 0.22 AML other m 2020-09-04T23:29:52.23
IV.SEI.HHE. ML:1.9 0.0001725 1.5 AML other m 2020-09-04T23:29:52.98
IV.PESA.HHN. ML:1.9 0.0001143 0.6 AML other m 2020-09-04T23:29:59.69
IV.PESA.HHE. ML:2.0 0.00013700000000000002 0.86 AML other m 2020-09-04T23:30:00.89
IV.NARO.HHE. ML:1.5 0.00004065 0.58 AML other m 2020-09-04T23:30:02.08
IV.NARO.HHN. ML:1.6 0.00005135 0.26 AML other m 2020-09-04T23:30:02.48
IV.CRTC.HHE. ML:2.1 0.00014900000000000002 0.36 AML other m 2020-09-04T23:30:03.43
IV.CRTC.HHN. ML:2.0 0.0001295 0.62 AML other m 2020-09-04T23:30:06.29
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