Earthquake with magnitude of ML 1.8 on date 18-10-2020 and time 21:13:27 (UTC) in region 4 km SW Marradi (FI)

A magnitude ML 1.8 earthquake occured in region: 4 km SW Marradi (FI), on

  • 18-10-2020 21:13:27 (UTC)
  • 18-10-2020 23:13:27 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.0400, 11.5880 at 9 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.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Marradi FI 5 3139 3139
Palazzuolo sul Senio FI 9 1154 4293
San Godenzo FI 13 1167 5460
Tredozio FC 13 1212 6672
Vicchio FI 15 8044 14716
Portico e San Benedetto FC 16 756 15472
Premilcuore FC 17 799 16271
Dicomano FI 17 5515 21786
Borgo San Lorenzo FI 19 18211 39997
Firenzuola FI 19 4726 44723
Londa FI 20 1840 46563

Municipalities with at least 50000 inhabitants

An earthquake occurred to
36 Km SW of Faenza (58541 inhabitants)
36 Km S of Imola (69797 inhabitants)
40 Km NE of Firenze (382808 inhabitants)
42 Km W of Forlì (117913 inhabitants)
43 Km E of Prato (191150 inhabitants)
45 Km NE of Scandicci (50609 inhabitants)
53 Km W of Cesena (96758 inhabitants)
54 Km SE of Bologna (386663 inhabitants)
55 Km E of Pistoia (90315 inhabitants)
64 Km SW of Ravenna (159116 inhabitants)
68 Km NW of Arezzo (99543 inhabitants)
78 Km W of Rimini (147750 inhabitants)
83 Km N of Siena (53903 inhabitants)
86 Km SE of Modena (184973 inhabitants)
89 Km S of Ferrara (133155 inhabitants)
90 Km E of Lucca (89046 inhabitants)
100 Km SE of Carpi (70699 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 2020-10-18
21:13:27
44.0405 11.5878 9 2021-02-26
14:56:06
Bollettino Sismico Italiano INGV 84771431
Reviewed
Rev100
ML 1.8 2020-10-18
21:13:27
44.044 11.587 9 2020-10-18
21:23:22
Sala Sismica INGV-Roma 83893261
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-10-18 21:13:27 ± 0.06
Latitude 44.0405 ± 0.0036
Longitude 11.5878 ± 0.0050
Depth (km) 9 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 84771431

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 356
Semi-minor axis of confidence ellipse (meter) 293
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 36
Circular confidence region, given by single value of horizontal uncertainty (meter) 390.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 77
Number of associated phases, regardless of their use for origin computation 32
Number of defining phases 29
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.27
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.82917
Number of stations at which the event was observed 25
Number of stations from which data was used for origin computation 22
Magnitudes information

ML:1.8

Field Value
Value 1.8
Uncertainty 0.2
Num. used stations 24
Type of magnitude ML
Reference to an origin 84771431
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2020-11-16 12:42:51

ML:1.8

Field Value
Value 1.8
Uncertainty 0.2
Num. used stations 26
Type of magnitude ML
Reference to an origin 83893261
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-10-18 21:23:22
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.SRES.HHZ. 2020-10-18T21:14:26.53 3.0 undecidable manual Sg 1.43 0
MN.TRI.HHZ. 2020-10-18T21:14:06.10 3.0 positive manual Pn 1.5 0
IV.PII.HHZ. 2020-10-18T21:13:44.24 0.3 undecidable manual P 248 92.0412 50 0.64 56
IV.PE3.EHZ. 2020-10-18T21:13:42.47 0.3 undecidable manual P 117 82.0512 50 0.41 62
IV.CSNT.HHZ. 2020-10-18T21:13:40.21 0.3 undecidable manual P 201 67.2771 50 0.43 63
IV.PARC.HHZ. 2020-10-18T21:13:39.57 0.3 undecidable manual P 130 67.7766 50 -0.29 65
GU.POPM.HHZ. 2020-10-18T21:13:39.57 0.3 undecidable manual P 271 66.2781 50 -0.05 69
IV.SSP9.EHZ. 2020-10-18T21:13:39.96 0.3 undecidable manual P 140 67.5768 50 0.13 68
IV.CRMI.HNZ. 2020-10-18T21:13:38.25 0.3 undecidable manual P 241 55.6998 50 0.25 67
IV.BRIS.HHZ. 2020-10-18T21:13:37.49 0.6 undecidable manual S 35 24.8529 110 0.6 43
IV.FIR.HHZ. 2020-10-18T21:13:36.75 3.0 undecidable manual P 0
IV.RUFI.EHZ. 2020-10-18T21:13:36.51 0.6 undecidable manual S 196 23.3544 111 0.12 49
IV.SFI.EHZ. 2020-10-18T21:13:36.81 0.3 undecidable manual S 126 25.5522 109 -0.31 70
IV.FNVD.HHZ. 2020-10-18T21:13:35.19 0.1 undecidable manual P 291 39.627 50 -0.33 91
IV.VISG.HHZ. 2020-10-18T21:13:35.32 0.3 undecidable manual S 323 20.4684 114 -0.16 73
IV.FAEN.HNZ. 2020-10-18T21:13:35.75 0.3 undecidable manual P 40 35.9418 50 0.8 59
IV.MPPT.EHZ. 2020-10-18T21:13:35.46 0.1 undecidable manual P 257 40.7259 50 -0.23 93
IV.MOCL.EHZ. 2020-10-18T21:13:34.24 0.1 undecidable manual P 263 32.745 50 -0.21 94
IV.IMOL.HNE. 2020-10-18T21:13:34.77 0.3 undecidable manual P 19 37.4292 50 -0.41 67
IT.FIE.HGE. 2020-10-18T21:13:34.63 0.1 undecidable manual P 222 34.9428 50 -0.16 95
IV.RINC.HHZ. 2020-10-18T21:13:34.59 0.3 undecidable manual S 175 17.1717 118 0.16 73
IV.MTRZ.HNZ. 2020-10-18T21:13:34.80 0.3 undecidable manual P 337 32.8449 50 0.32 69
IV.SEI.HHZ. 2020-10-18T21:13:34.70 0.3 undecidable manual S 275 18.3705 116 -0.1 74
IV.RONT.HHZ. 2020-10-18T21:13:33.53 0.1 undecidable manual S 247 13.3755 124 0.22 97
IV.ASQU.HHZ. 2020-10-18T21:13:33.94 0.1 undecidable manual P 149 31.4463 50 -0.33 92
IV.BRIS.HHZ. 2020-10-18T21:13:32.97 0.1 undecidable manual P 35 24.8529 110 -0.05 99
IV.SFI.EHZ. 2020-10-18T21:13:32.87 0.1 positive manual P 126 25.5522 109 -0.28 94
IV.VISG.HHZ. 2020-10-18T21:13:32.01 0.1 negative manual P 323 20.4684 114 -0.19 97
IV.RUFI.EHZ. 2020-10-18T21:13:32.64 0.1 positive manual P 196 23.3544 111 -0.08 99
IV.RINC.HHZ. 2020-10-18T21:13:31.66 0.1 positive manual P 175 17.1717 118 0.06 100
IV.SEI.HHZ. 2020-10-18T21:13:31.70 0.1 positive manual P 275 18.3705 116 -0.1 99
IV.RONT.HHZ. 2020-10-18T21:13:31.12 0.1 positive manual P 247 13.3755 124 0.17 98
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.VISG.HHN. ML:2.1 0.0009665 0.1 AML other m 2020-10-18T21:13:35.65
IV.RINC.HHE. ML:1.9 0.000759 0.22 AML other m 2020-10-18T21:13:35.73
IV.VISG.HHE. ML:1.9 0.000615 0.12 AML other m 2020-10-18T21:13:35.71
IV.RINC.HHN. ML:1.9 0.0006605000000000001 0.3 AML other m 2020-10-18T21:13:35.72
IV.SFI.EHE. ML:1.7 0.0003135 0.14 AML other m 2020-10-18T21:13:37.53
IV.SFI.HNE. ML:1.8 0.00032299999999999994 0.14 AML other m 2020-10-18T21:13:37.53
IV.SFI.EHN. ML:1.7 0.000309 0.72 AML other m 2020-10-18T21:13:37.20
IV.SFI.HNN. ML:1.7 0.00028100000000000005 1.32 AML other m 2020-10-18T21:13:37.20
IV.BRIS.HHE. ML:1.9 0.000529 0.34 AML other m 2020-10-18T21:13:37.93
IV.BRIS.HHN. ML:2.0 0.0006085 0.34 AML other m 2020-10-18T21:13:38.17
IV.ASQU.HHE. ML:2.0 0.0004865 0.64 AML other m 2020-10-18T21:13:39.26
IV.ASQU.HHN. ML:1.9 0.000404 0.72 AML other m 2020-10-18T21:13:39.45
IV.MOCL.EHE. ML:2.0 0.0005434999999999999 1.5 AML other m 2020-10-18T21:13:39.95
IV.MOCL.EHN. ML:2.3 0.0009025000000000001 1.02 AML other m 2020-10-18T21:13:40.05
IV.FNVD.HHE. ML:1.7 0.000192 1.62 AML other m 2020-10-18T21:13:41.17
IV.MPPT.EHN. ML:1.5 0.00009865 0.54 AML other m 2020-10-18T21:13:42.89
IV.MPPT.EHE. ML:1.6 0.000121 1.22 AML other m 2020-10-18T21:13:43.91
IV.FNVD.HHN. ML:1.6 0.000141 0.52 AML other m 2020-10-18T21:13:45.64
GU.POPM.HHE. ML:1.7 0.0000922 0.2 AML other m 2020-10-18T21:13:49.78
GU.POPM.HHN. ML:1.8 0.00010865 1.28 AML other m 2020-10-18T21:13:49.18
IV.CSNT.HHE. ML:1.5 0.00005875 0.76 AML other m 2020-10-18T21:13:52.06
IV.CSNT.HHN. ML:1.4 0.0000521 0.56 AML other m 2020-10-18T21:13:52.62
IV.PII.HHE. ML:1.7 0.000052699999999999993 0.42 AML other m 2020-10-18T21:13:55.76
IV.PII.HHN. ML:1.6 0.00005215 1.66 AML other m 2020-10-18T21:13:55.14
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