Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.6 on date 31-01-2020 and time 22:19:33 (Italy) in region 6 km W Santa Sofia (FC)

A magnitude ML 1.6 earthquake occured in region: 6 km W Santa Sofia (FC), on

  • 31-01-2020 21:19:33 (UTC)
  • 31-01-2020 22:19:33 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.9290, 11.8330 at 8 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
Santa Sofia FC 7 4136 4136
Premilcuore FC 7 799 4935
Galeata FC 10 2516 7451
Portico e San Benedetto FC 12 756 8207
Civitella di Romagna FC 12 3786 11993
Bagno di Romagna FC 14 6026 18019
Rocca San Casciano FC 15 1910 19929
San Godenzo FI 17 1167 21096
Pratovecchio Stia AR 18 5845 26941
Tredozio FC 18 1212 28153

Municipalities with at least 50000 inhabitants

An earthquake occurred to
37 Km SW of Forlì (117913 inhabitants)
40 Km S of Faenza (58541 inhabitants)
40 Km SW of Cesena (96758 inhabitants)
48 Km S of Imola (69797 inhabitants)
49 Km E of Firenze (382808 inhabitants)
52 Km N of Arezzo (99543 inhabitants)
56 Km E of Scandicci (50609 inhabitants)
59 Km E of Prato (191150 inhabitants)
61 Km W of Rimini (147750 inhabitants)
62 Km SW of Ravenna (159116 inhabitants)
73 Km E of Pistoia (90315 inhabitants)
74 Km SE of Bologna (386663 inhabitants)
79 Km NE of Siena (53903 inhabitants)
87 Km W of Pesaro (94582 inhabitants)
96 Km W of Fano (60888 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 1.6 2020-01-31
21:19:33		 43.9288 11.8327 8 2020-07-18
21:08:21		 Bollettino Sismico Italiano INGV 76647891
Reviewed
Rev100 		ML 1.7 2020-01-31
21:19:33		 43.9275 11.8315 8 2020-01-31
21:29:38		 Sala Sismica INGV-Roma 76082241
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-01-31 21:19:33 ± 0.08
Latitude 43.9288 ± 0.0045
Longitude 11.8327 ± 0.0050
Depth (km) 8 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 76647891

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 536
Semi-minor axis of confidence ellipse (meter) 192
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 217
Circular confidence region, given by single value of horizontal uncertainty (meter) 540.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 119
Number of associated phases, regardless of their use for origin computation 40
Number of defining phases 39
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.3
Epicentral distance of station closest to the epicenter (degree) 0.02608
Epicentral distance of station farthest from the epicenter (degree) 0.96497
Number of stations at which the event was observed 20
Number of stations from which data was used for origin computation 20
Magnitudes information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.3
Num. used stations 24
Type of magnitude ML
Reference to an origin 76647891
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2020-02-19 12:04:04

ML:1.7

Field Value
Value 1.7
Uncertainty 0.3
Num. used stations 32
Type of magnitude ML
Reference to an origin 76082241
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-01-31 21:29:38
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.PII.HHZ. 2020-01-31T21:20:05.10 0.3 undecidable manual S 258 107.115 50 -0.64 53
IV.ATMI.HHZ. 2020-01-31T21:19:57.64 0.3 undecidable manual S 152 74.6697 50 0.57 58
IV.PIEI.HHZ. 2020-01-31T21:19:56.37 0.3 undecidable manual S 128 71.1732 50 0.21 64
IV.OSSC.HHZ. 2020-01-31T21:19:55.02 0.3 undecidable manual S 226 65.0904 50 0.51 61
IV.APEC.HHZ. 2020-01-31T21:19:54.44 1.0 undecidable manual S 131 62.493 50 0.61 20
IV.PE3.EHZ. 2020-01-31T21:19:54.19 3.0 undecidable manual S 116 59.0964 50 1.27 0
IV.MPPT.EHZ. 2020-01-31T21:19:53.19 0.3 undecidable manual S 273 59.3961 50 0.19 66
IV.PII.HHZ. 2020-01-31T21:19:52.83 0.1 undecidable manual P 258 107.115 50 0.54 74
IV.BADI.EHZ. 2020-01-31T21:19:52.48 0.3 undecidable manual S 144 56.9985 50 0.11 67
IV.SSP9.EHZ. 2020-01-31T21:19:49.41 0.3 undecidable manual S 149 46.1205 50 -0.04 70
IV.PARC.HHZ. 2020-01-31T21:19:48.97 0.3 undecidable manual S 134 45.0216 50 -0.19 68
IV.CPGN.EHZ. 2020-01-31T21:19:48.48 0.6 undecidable manual S 110 41.5251 50 0.25 45
IV.VISG.HHZ. 2020-01-31T21:19:48.51 0.3 undecidable manual S 312 42.9237 50 -0.09 69
IV.ATMI.HHZ. 2020-01-31T21:19:47.34 0.1 undecidable manual P 152 74.6697 50 0.06 88
IV.SEI.HHZ. 2020-01-31T21:19:47.79 0.3 undecidable manual S 290 40.3263 50 -0.12 69
IV.BRIS.HHZ. 2020-01-31T21:19:46.29 0.3 undecidable manual S 351 33.2445 103 0.55 63
IV.PIEI.HHZ. 2020-01-31T21:19:46.39 0.1 undecidable manual P 128 71.1732 50 -0.37 83
IV.CRE.HHZ. 2020-01-31T21:19:46.45 0.3 undecidable manual S 164 35.742 102 -0.12 70
IV.RONT.HHZ. 2020-01-31T21:19:46.04 0.3 undecidable manual S 283 32.745 103 0.47 65
IV.PE3.EHZ. 2020-01-31T21:19:45.59 0.1 undecidable manual P 116 59.0964 50 0.71 76
IV.OSSC.HHZ. 2020-01-31T21:19:45.72 0.1 undecidable manual P 226 65.0904 50 -0.09 89
IV.APEC.HHZ. 2020-01-31T21:19:45.15 0.6 undecidable manual P 131 62.493 50 -0.26 43
IV.BADI.EHZ. 2020-01-31T21:19:44.21 0.1 undecidable manual P 144 56.9985 50 -0.36 85
IV.MPPT.EHZ. 2020-01-31T21:19:44.71 0.1 undecidable manual P 273 59.3961 50 -0.22 87
IV.RUFI.EHE. 2020-01-31T21:19:43.67 0.3 undecidable manual S 249 27.75 105 -0.22 69
IV.SSP9.EHZ. 2020-01-31T21:19:42.74 0.1 undecidable manual P 149 46.1205 50 -0.14 91
IV.VISG.HHZ. 2020-01-31T21:19:42.12 0.1 undecidable manual P 312 42.9237 50 -0.27 89
IV.PARC.HHZ. 2020-01-31T21:19:42.15 0.1 undecidable manual P 134 45.0216 50 -0.56 82
IV.CPGN.EHZ. 2020-01-31T21:19:42.64 0.1 undecidable manual P 110 41.5251 50 0.46 86
IV.SEI.HHZ. 2020-01-31T21:19:41.53 0.1 undecidable manual P 290 40.3263 50 -0.46 86
IV.RINC.HHZ. 2020-01-31T21:19:41.17 0.1 undecidable manual S 255 18.6702 112 0.28 93
IV.RONT.HHZ. 2020-01-31T21:19:40.53 0.1 undecidable manual P 283 32.745 103 -0.11 94
IV.ASQU.HHZ. 2020-01-31T21:19:40.16 0.3 undecidable manual S 193 15.0738 117 0.39 68
IV.BRIS.HHZ. 2020-01-31T21:19:40.67 0.1 undecidable manual P 351 33.2445 103 -0.07 94
IV.CRE.HHZ. 2020-01-31T21:19:40.75 0.1 positive manual P 164 35.742 102 -0.47 86
IV.RUFI.EHE. 2020-01-31T21:19:39.52 0.1 undecidable manual P 249 27.75 105 -0.15 94
IV.RINC.HHZ. 2020-01-31T21:19:38.04 0.1 undecidable manual P 255 18.6702 112 0.09 96
IV.ASQU.HHZ. 2020-01-31T21:19:37.51 0.1 positive manual P 193 15.0738 117 0.21 95
IV.SFI.EHZ. 2020-01-31T21:19:36.42 0.3 undecidable manual S 157 2.8971 159 -0.31 71
IV.SFI.EHZ. 2020-01-31T21:19:35.50 0.1 undecidable manual P 157 2.8971 159 -0.04 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.ASQU.HHN. ML:1.9 0.0008755000000000001 0.36 AML other m 2020-01-31T21:19:40.56
IV.ASQU.HHE. ML:1.7 0.0004985 0.7 AML other m 2020-01-31T21:19:40.87
IV.RINC.HHE. ML:1.9 0.0006395 0.32 AML other m 2020-01-31T21:19:41.54
IV.BRIS.HHE. ML:2.1 0.00061 0.24 AML other m 2020-01-31T21:19:46.88
IV.CRE.HHN. ML:1.8 0.000279 0.54 AML other m 2020-01-31T21:19:46.62
IV.BRIS.HHN. ML:2.0 0.000447 0.22 AML other m 2020-01-31T21:19:46.80
IV.SEI.HHN. ML:2.3 0.000771 0.32 AML other m 2020-01-31T21:19:48.14
IV.SEI.HHE. ML:2.0 0.000312 1.26 AML other m 2020-01-31T21:19:48.06
IV.CRE.HHE. ML:1.5 0.0001275 0.98 AML other m 2020-01-31T21:19:48.73
IV.VISG.HHE. ML:1.2 0.0000543 0.98 AML other m 2020-01-31T21:19:49.12
IV.PARC.HHN. ML:1.5 0.00009075 0.28 AML other m 2020-01-31T21:19:50.59
IV.VISG.HHN. ML:1.3 0.00006429999999999999 0.3 AML other m 2020-01-31T21:19:51.73
IV.PARC.HHE. ML:1.3 0.00005415 1.28 AML other m 2020-01-31T21:19:52.06
IV.MPPT.EHN. ML:1.5 0.00006915 0.52 AML other m 2020-01-31T21:19:53.87
IV.MPPT.EHE. ML:1.3 0.000041 0.56 AML other m 2020-01-31T21:19:54.04
IV.BADI.EHE. ML:1.5 0.00007675 0.64 AML other m 2020-01-31T21:19:54.87
IV.BADI.EHN. ML:1.5 0.0000742 1.56 AML other m 2020-01-31T21:19:55.96
IV.OSSC.HHN. ML:1.3 0.000039099999999999995 0.84 AML other m 2020-01-31T21:19:56.54
IV.ATMI.HHE. ML:1.7 0.00007625 0.4 AML other m 2020-01-31T21:19:58.50
IV.OSSC.HHE. ML:1.4 0.000043700000000000005 0.42 AML other m 2020-01-31T21:19:58.35
IV.PIEI.HHE. ML:1.3 0.0000302 0.18 AML other m 2020-01-31T21:19:58.58
IV.PIEI.HHN. ML:1.1 0.0000183 0.34 AML other m 2020-01-31T21:19:58.58
IV.ATMI.HHN. ML:1.7 0.00007645 0.56 AML other m 2020-01-31T21:20:01.17
IV.SFI.HNN. ML:0.0 0.011300524499999999 0.0768 AML other m 2020-01-31T21:19:36.60
IV.SFI.EHN. ML:0.0 0.0114752055 0.0768 AML other m 2020-01-31T21:19:36.60
IV.SFI.HNE. ML:0.0 0.012010781 0.1408 AML other m 2020-01-31T21:19:36.53
IV.SFI.EHE. ML:0.0 0.0118044035 0.1408 AML other m 2020-01-31T21:19:36.53
IV.RINC.HHN. ML:1.5 0.00028346765 0.4608 AML other m 2020-01-31T21:19:44.80
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