Earthquake with magnitude of ML 1.0 on date 18-12-2020 and time 21:23:53 (UTC) in region 2 km SW Palazzuolo sul Senio (FI)

A magnitude ML 1.0 earthquake occured in region: 2 km SW Palazzuolo sul Senio (FI), on

  • 18-12-2020 21:23:53 (UTC)
  • 18-12-2020 22:23:53 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 44.0970, 11.5280 at 10 km depth.

The earthquake was located by: Sala Sismica INGV-Roma.

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
Palazzuolo sul Senio FI 2 1154 1154
Marradi FI 7 3139 4293
Firenzuola FI 12 4726 9019
Castel del Rio BO 13 1246 10265
Casola Valsenio RA 16 2617 12882
Tredozio FC 17 1212 14094
Fontanelice BO 18 1943 16037
Vicchio FI 19 8044 24081
Borgo San Lorenzo FI 19 18211 42292

Municipalities with at least 50000 inhabitants

An earthquake occurred to
32 Km SW of Imola (69797 inhabitants)
35 Km SW of Faenza (58541 inhabitants)
42 Km NE of Prato (191150 inhabitants)
42 Km NE of Firenze (382808 inhabitants)
43 Km W of Forlì (117913 inhabitants)
47 Km NE of Scandicci (50609 inhabitants)
47 Km SE of Bologna (386663 inhabitants)
52 Km E of Pistoia (90315 inhabitants)
57 Km W of Cesena (96758 inhabitants)
64 Km SW of Ravenna (159116 inhabitants)
76 Km NW of Arezzo (99543 inhabitants)
78 Km SE of Modena (184973 inhabitants)
83 Km S of Ferrara (133155 inhabitants)
83 Km W of Rimini (147750 inhabitants)
87 Km E of Lucca (89046 inhabitants)
88 Km N of Siena (53903 inhabitants)
92 Km SE of Carpi (70699 inhabitants)
98 Km SE of Reggio nell'Emilia (171345 inhabitants)
100 Km E of Pisa (89158 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
Reviewed
Rev100
ML 1.0 2020-12-18
21:23:53
44.0968 11.5285 10 2020-12-18
21:32:24
Sala Sismica INGV-Roma 85529321
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-12-18 21:23:53 ± 0.09
Latitude 44.0968 ± 0.0063
Longitude 11.5285 ± 0.0100
Depth (km) 10 ± 3 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 85529321

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 680
Semi-minor axis of confidence ellipse (meter) 618
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 238
Circular confidence region, given by single value of horizontal uncertainty (meter) 680.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 89
Number of associated phases, regardless of their use for origin computation 18
Number of defining phases 13
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.28
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.35343
Number of stations at which the event was observed 12
Number of stations from which data was used for origin computation 7
Magnitude information

ML:1.0

Field Value
Value 1.0
Uncertainty 0.3
Num. used stations 16
Type of magnitude ML
Reference to an origin 85529321
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-12-18 21:32:24
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.VVLD.HHZ. 2020-12-18T21:24:50.42 3.0 undecidable manual Sn 0.63 0
IV.MTCE.HHZ. 2020-12-18T21:24:42.60 3.0 undecidable manual Sg 3.97 0
IV.ATCC.EHZ. 2020-12-18T21:24:15.79 3.0 undecidable manual Sg 1.38 0
IV.ASQU.HHZ. 2020-12-18T21:24:07.22 0.3 undecidable manual S 148 39.2274 50 0.08 68
IV.RUFI.EHZ. 2020-12-18T21:24:04.01 0.3 undecidable manual S 183 28.749 50 -0.32 71
IV.BRIS.HHZ. 2020-12-18T21:24:03.34 0.3 undecidable manual S 53 23.6541 113 0.44 62
IV.COR1.EHZ. 2020-12-18T21:24:02.18 3.0 undecidable manual P -1.04 0
IV.ASQU.HHZ. 2020-12-18T21:24:01.37 0.1 undecidable manual P 148 39.2274 50 -0.21 94
IV.SEI.HHZ. 2020-12-18T21:24:00.16 0.3 undecidable manual S 251 14.3745 125 0.1 74
IV.RONT.HHZ. 2020-12-18T21:24:00.48 0.3 undecidable manual S 214 13.7751 126 0.58 70
IV.RUFI.EHZ. 2020-12-18T21:23:59.76 0.1 undecidable manual P 183 28.749 50 -0.2 96
IV.VISG.HHZ. 2020-12-18T21:23:59.64 0.3 undecidable manual S 324 12.6762 128 0.04 74
IV.BRIS.HHZ. 2020-12-18T21:23:59.21 0.1 undecidable manual P 53 23.6541 113 0.08 94
IV.VISG.HHZ. 2020-12-18T21:23:57.31 0.1 undecidable manual P 324 12.6762 128 0.09 100
IV.RONT.HHZ. 2020-12-18T21:23:57.56 0.1 undecidable manual P 214 13.7751 126 0.17 99
IV.PE3.EHZ. 2020-12-18T21:23:57.07 3.0 negative manual P -1.42 0
IV.SEI.HHZ. 2020-12-18T21:23:57.58 0.1 undecidable manual P 251 14.3745 125 0.09 100
IV.LMD.HHZ. 2020-12-18T21:23:57.08 0.1 undecidable manual P 98 14.3745 125 -0.42 89
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.LMD.HHE. ML:0.6 0.00003307066 0.5504 AML other m 2020-12-18T21:24:04.29
IV.LMD.HHN. ML:0.7 0.00004525206499999999 0.1536 AML other m 2020-12-18T21:24:01.46
IV.VISG.HHE. ML:0.7 0.000048023085 0.0768 AML other m 2020-12-18T21:23:59.78
IV.VISG.HHN. ML:0.7 0.000058984590000000004 0.0896 AML other m 2020-12-18T21:23:59.84
IV.RONT.HHE. ML:1.1 0.00012281585000000001 0.1024 AML other m 2020-12-18T21:24:01.85
IV.RONT.HHN. ML:1.1 0.00012571404999999999 0.1152 AML other m 2020-12-18T21:24:00.89
IV.SEI.HHE. ML:1.1 0.0001142218 0.4096 AML other m 2020-12-18T21:24:03.07
IV.SEI.HHN. ML:1.1 0.00013483435 0.4864 AML other m 2020-12-18T21:24:02.42
IV.BRIS.HNE. ML:1.3 0.000132305665 0.704 AML other m 2020-12-18T21:24:02.64
IV.BRIS.HNN. ML:1.6 0.00024404759999999996 0.704 AML other m 2020-12-18T21:24:00.22
IV.BRIS.HHE. ML:1.0 0.000063123825 0.1792 AML other m 2020-12-18T21:24:03.43
IV.BRIS.HHN. ML:1.2 0.00010299115 0.2048 AML other m 2020-12-18T21:24:03.56
IV.RUFI.EHE. ML:1.0 0.00005128807499999999 54.6944 AML other m 2020-12-18T21:23:59.86
IV.RUFI.EHN. ML:1.0 0.0000529124 3.6096 AML other m 2020-12-18T21:24:17.48
IV.ASQU.HHE. ML:0.6 0.000016760669 0.1408 AML other m 2020-12-18T21:24:07.82
IV.ASQU.HHN. ML:0.6 0.000012802966 0.1408 AML other m 2020-12-18T21:24:07.62
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