Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.6 on date 31-01-2018 and time 13:54:26 (Italy) in region 4 km W Brisighella (RA)

A magnitude ML 1.6 earthquake occured in region: 4 km W Brisighella (RA), on

  • 31-01-2018 12:54:26 (UTC)
  • 31-01-2018 13:54:26 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 44.2180, 11.7240 at 19 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
Brisighella RA 4 7639 7639
Riolo Terme RA 7 5720 13359
Casola Valsenio RA 8 2617 15976
Modigliana FC 9 4560 20536
Casalfiumanese BO 12 3438 23974
Borgo Tossignano BO 13 3288 27262
Castel Bolognese RA 13 9554 36816
Fontanelice BO 14 1943 38759
Faenza RA 15 58541 97300
Imola BO 15 69797 167097
Tredozio FC 15 1212 168309
Dovadola FC 17 1653 169962
Castel del Rio BO 17 1246 171208
Dozza BO 18 6652 177860
Marradi FI 18 3139 180999
Palazzuolo sul Senio FI 18 1154 182153
Solarolo RA 19 4488 186641
Castrocaro Terme e Terra del Sole FC 19 6426 193067
Rocca San Casciano FC 20 1910 194977

Municipalities with at least 50000 inhabitants

An earthquake occurred to
15 Km SW of Faenza (58541 inhabitants)
15 Km S of Imola (69797 inhabitants)
25 Km W of Forlì (117913 inhabitants)
42 Km W of Cesena (96758 inhabitants)
43 Km SE of Bologna (386663 inhabitants)
44 Km SW of Ravenna (159116 inhabitants)
62 Km NE of Firenze (382808 inhabitants)
63 Km NE of Prato (191150 inhabitants)
67 Km NE of Scandicci (50609 inhabitants)
69 Km S of Ferrara (133155 inhabitants)
70 Km W of Rimini (147750 inhabitants)
72 Km E of Pistoia (90315 inhabitants)
79 Km SE of Modena (184973 inhabitants)
84 Km N of Arezzo (99543 inhabitants)
92 Km SE of Carpi (70699 inhabitants)
95 Km S of Rovigo (51867 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 2018-01-31
12:54:26		 44.218 11.7238 19 2019-04-24
14:49:30		 Bollettino Sismico Italiano INGV 56369411
Reviewed
Rev100 		ML 1.4 2018-01-31
12:54:26		 44.218 11.7238 19 2018-01-31
13:05:29		 Sala Sismica INGV-Roma 53578841
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2018-01-31 12:54:26 ± 0.38
Latitude 44.2180 ± 0.0144
Longitude 11.7238 ± 0.0201
Depth (km) 19 ± 3 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 56369411

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1558
Semi-minor axis of confidence ellipse (meter) 1128
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 133
Circular confidence region, given by single value of horizontal uncertainty (meter) 1560.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 123
Number of associated phases, regardless of their use for origin computation 34
Number of defining phases 13
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.42
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.41009
Number of stations at which the event was observed 27
Number of stations from which data was used for origin computation 7
Magnitudes information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.1
Num. used stations 6
Type of magnitude ML
Reference to an origin 56369411
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2018-05-02 14:40:23

ML:1.4

Field Value
Value 1.4
Uncertainty 0.3
Num. used stations 8
Type of magnitude ML
Reference to an origin 53578841
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2018-01-31 13:05:29
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.GALF.HHZ. 2018-01-31T12:56:23.36 3.0 negative manual Pg 21.82 0
IV.MFNL.HHZ. 2018-01-31T12:56:18.87 3.0 positive manual Pg 22.02 0
IV.VULT.HHZ. 2018-01-31T12:56:17.48 3.0 undecidable manual Sn 2.71 0
GU.CIRO.HHZ. 2018-01-31T12:56:06.87 3.0 undecidable manual Sg 9.42 0
IV.CET2.HHZ. 2018-01-31T12:56:01.80 3.0 undecidable manual Pg 16.98 0
IV.SPS2.HHZ. 2018-01-31T12:55:52.22 3.0 negative manual Pn 2.45 0
IV.USI.HHZ. 2018-01-31T12:55:48.53 3.0 undecidable manual Pn 3.74 0
IV.MRVN.HHZ. 2018-01-31T12:55:30.30 3.0 undecidable manual Pn 0.48 0
IV.PTRJ.HHZ. 2018-01-31T12:55:28.83 3.0 undecidable manual Pg 13.27 0
IV.MMO1.EHZ. 2018-01-31T12:55:18.79 3.0 undecidable manual Sg 7.23 0
IV.AGLI.HHZ. 2018-01-31T12:55:14.72 3.0 undecidable manual Pn -4.45 0
IV.QLNO.HHZ. 2018-01-31T12:55:06.47 3.0 positive manual Pn 1.17 0
IV.MNTP.HNZ. 2018-01-31T12:55:06.79 3.0 undecidable manual Sn -2.39 0
IV.CRND.HNZ. 2018-01-31T12:55:04.86 3.0 undecidable manual Sn -9.99 0
IV.EUCT.HNZ. 2018-01-31T12:55:04.77 3.0 undecidable manual Pg 3.68 0
IV.RIBO.EHZ.01 2018-01-31T12:55:01.21 3.0 undecidable manual Sn -4.12 0
IV.NDIM.HNZ. 2018-01-31T12:54:58.86 3.0 undecidable manual Sg -0.76 0
IV.MSSA.HHZ. 2018-01-31T12:54:53.80 3.0 undecidable manual Pn 0.01 0
IV.LNSS.HHZ. 2018-01-31T12:54:51.15 3.0 undecidable manual Pn -1.94 0
IV.RUFI.EHE. 2018-01-31T12:54:42.06 0.6 undecidable manual S 202 45.5211 104 0.34 45
IV.NDIM.HNZ. 2018-01-31T12:54:40.97 3.0 negative manual Pn -3.65 0
IV.SFI.EHZ. 2018-01-31T12:54:39.58 0.3 undecidable manual S 164 36.1416 108 0.27 69
IV.SEI.HHN. 2018-01-31T12:54:39.22 0.6 undecidable manual S 238 34.3434 109 0.37 46
IV.MTRZ.HHZ. 2018-01-31T12:54:36.00 0.3 undecidable manual S 294 25.9518 117 -0.81 59
IV.RUFI.EHE. 2018-01-31T12:54:35.00 0.1 undecidable manual P 202 45.5211 104 -0.44 88
IV.SEI.HHN. 2018-01-31T12:54:34.11 0.6 undecidable manual P 238 34.3434 109 0.33 46
IV.LMD.HHZ. 2018-01-31T12:54:34.55 0.3 undecidable manual S 185 15.6732 134 0 76
IV.BRIS.HHZ. 2018-01-31T12:54:33.09 0.3 undecidable manual S 78 3.4965 168 0.15 75
IV.MTRZ.HHZ. 2018-01-31T12:54:33.49 0.1 undecidable manual P 294 25.9518 117 0.88 78
IV.SFI.EHZ. 2018-01-31T12:54:33.68 0.1 undecidable manual P 164 36.1416 108 -0.37 91
IV.FAEN.HNZ. 2018-01-31T12:54:31.42 0.3 undecidable manual P 57 14.4744 136 0.24 73
IV.LMD.HHZ. 2018-01-31T12:54:31.03 0.1 undecidable manual P 185 15.6732 134 -0.27 97
IV.BRIS.HHZ. 2018-01-31T12:54:30.17 0.1 undecidable manual P 78 3.4965 168 -0.2 100
IV.IMOL.EHZ. 2018-01-31T12:54:24.76 3.0 undecidable manual P 0
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.BRIS.HHN. ML:1.5 0.000305 0.18 AML other m 2018-01-31T12:54:33.40
IV.BRIS.HNN. ML:1.5 0.000287577 1.0496 AML other m 2018-01-31T12:54:33.39
IV.LMD.HHE. ML:1.5 0.00019250000000000002 0.14 AML other m 2018-01-31T12:54:34.86
IV.LMD.HHN. ML:1.8 0.0004455 0.18 AML other m 2018-01-31T12:54:34.88
IV.SFI.EHE. ML:0.9 0.000027950000000000002 0.48 AML other m 2018-01-31T12:54:40.25
IV.BRIS.HNE. ML:1.4 0.00024325780000000003 0.1152 AML other m 2018-01-31T12:54:33.27
IV.BRIS.HHE. ML:1.5 0.0002608451 0.1152 AML other m 2018-01-31T12:54:33.21
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