Earthquake with magnitude of ML 1.2 on date 21-10-2020 and time 01:25:17 (UTC) in region 6 km SW Palazzuolo sul Senio (FI)

A magnitude ML 1.2 earthquake occured in region: 6 km SW Palazzuolo sul Senio (FI), on

  • 21-10-2020 01:25:17 (UTC)
  • 21-10-2020 03:25:17 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.07, 11.52 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 6 1154 1154
Marradi FI 8 3139 4293
Firenzuola FI 12 4726 9019
Vicchio FI 15 8044 17063
Castel del Rio BO 16 1246 18309
Borgo San Lorenzo FI 16 18211 36520
San Godenzo FI 18 1167 37687
Tredozio FC 18 1212 38899
Casola Valsenio RA 19 2617 41516
Scarperia e San Piero FI 19 12217 53733
Dicomano FI 20 5515 59248

Municipalities with at least 50000 inhabitants

An earthquake occurred to
35 Km SW of Imola (69797 inhabitants)
38 Km SW of Faenza (58541 inhabitants)
39 Km NE of Firenze (382808 inhabitants)
40 Km NE of Prato (191150 inhabitants)
44 Km NE of Scandicci (50609 inhabitants)
45 Km W of Forlì (117913 inhabitants)
50 Km S of Bologna (386663 inhabitants)
50 Km E of Pistoia (90315 inhabitants)
58 Km W of Cesena (96758 inhabitants)
67 Km SW of Ravenna (159116 inhabitants)
73 Km NW of Arezzo (99543 inhabitants)
80 Km SE of Modena (184973 inhabitants)
84 Km W of Rimini (147750 inhabitants)
85 Km N of Siena (53903 inhabitants)
85 Km E of Lucca (89046 inhabitants)
86 Km S of Ferrara (133155 inhabitants)
94 Km SE of Carpi (70699 inhabitants)
98 Km E of Pisa (89158 inhabitants)
99 Km SE of Reggio nell'Emilia (171345 inhabitants)
Recent and historical Seismicity
Seismic hazard
Shakemap
Felt maps
The earthquake effects in MCS scale as obtained from the compiled questionnaire

The earthquake effects in MCS scale as obtained from the compiled questionnaire

This map shows the distribution of the effects of the earthquake on the territory in terms of the MCS (Mercalli-Cancani-Sieberg) intensity scale. The intensities are determined using the data provided in the questionnaire (http://www.haisentitoilterremoto.it/) that are analysed using robust statistical techniques since they are not verified individually. Specifically, the assignment of MCS intensities greater or equal the VI degree of the MCS scale require opportune in situ verification by professional experts. The purple start shows the epicenter. This map is prepared every so often that the population fill in new questionnaires. The number of questionnaires used to determine the map and the date and time of the last adjournment are shown in the upper right part of the panel.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100
ML 1.2 2020-10-21
01:25:17
44.07 11.52 10 2020-10-21
01:29:39
Sala Sismica INGV-Roma 83971991
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-10-21 01:25:17 ± 0.09
Latitude 44.07 ± 0.00
Longitude 11.52 ± 0.01
Depth (km) 10 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 83971991

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 340
Semi-minor axis of confidence ellipse (meter) 171
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 115
Circular confidence region, given by single value of horizontal uncertainty (meter) 340
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 76
Number of associated phases, regardless of their use for origin computation 13
Number of defining phases 13
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.15
Epicentral distance of station closest to the epicenter (degree) 0.09623
Epicentral distance of station farthest from the epicenter (degree) 0.32645
Number of stations at which the event was observed 8
Number of stations from which data was used for origin computation 8
Magnitude information

ML:1.2

Field Value
Value 1.2
Uncertainty 0.2
Num. used stations 12
Type of magnitude ML
Reference to an origin 83971991
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-10-21 01:29:39
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.BRIS.HHZ. 2020-10-21T01:25:27.47 0.3 undecidable manual S 49 0.2374 110 0.23 71
IV.RINC.HHZ. 2020-10-21T01:25:25.41 0.3 undecidable manual S 161 0.1925 115 -0.26 71
IV.MPPT.EHZ. 2020-10-21T01:25:24.96 1.0 negative manual P 250 0.3265 50 0.28 23
IV.MOCL.EHZ. 2020-10-21T01:25:23.36 1.0 undecidable manual P 255 0.25 50 -0.01 25
IV.SEI.HHZ. 2020-10-21T01:25:23.03 0.3 undecidable manual S 263 0.1151 127 -0.06 75
IV.SFI.EHZ. 2020-10-21T01:25:23.76 1.0 positive manual P 125 0.2878 50 -0.25 23
IV.BRIS.HHZ. 2020-10-21T01:25:23.13 0.1 undecidable manual P 49 0.2374 110 0 99
IV.VISG.HHZ. 2020-10-21T01:25:23.47 0.3 undecidable manual S 334 0.134 123 -0.23 72
IV.RONT.HHZ. 2020-10-21T01:25:22.78 0.3 undecidable manual S 219 0.0962 132 0.24 72
IV.RINC.HHZ. 2020-10-21T01:25:22.22 0.1 undecidable manual P 161 0.1925 115 0 100
IV.VISG.HHZ. 2020-10-21T01:25:21.02 0.1 undecidable manual P 334 0.134 123 -0.06 99
IV.SEI.HHZ. 2020-10-21T01:25:20.78 0.1 undecidable manual P 263 0.1151 127 0.05 100
IV.RONT.HHZ. 2020-10-21T01:25:20.65 1.0 undecidable manual P 219 0.0962 132 0.24 24
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SEI.HHE. ML:1.3 0.0001995 0.5 AML other m 2020-10-21T01:25:23.28
IV.SEI.HHN. ML:1.5 0.0003515 0.2 AML other m 2020-10-21T01:25:23.66
IV.VISG.HHE. ML:1.1 0.00011695 0.86 AML other m 2020-10-21T01:25:23.95
IV.VISG.HHN. ML:1.3 0.000189 0.14 AML other m 2020-10-21T01:25:24.10
IV.RONT.HHE. ML:1.5 0.0004145 0.24 AML other m 2020-10-21T01:25:24.33
IV.RONT.HHN. ML:1.3 0.0002425 0.72 AML other m 2020-10-21T01:25:24.38
IV.RINC.HHE. ML:1.1 9.395E-5 0.56 AML other m 2020-10-21T01:25:26.41
IV.RINC.HHN. ML:0.9 4.995E-5 1.36 AML other m 2020-10-21T01:25:27.09
IV.BRIS.HHN. ML:1.1 7.045E-5 1.68 AML other m 2020-10-21T01:25:27.90
IV.BRIS.HHE. ML:1.1 6.63E-5 0.5 AML other m 2020-10-21T01:25:28.31
IV.MOCL.EHN. ML:1.2 9.175E-5 0.28 AML other m 2020-10-21T01:25:28.37
IV.MOCL.EHE. ML:1.1 6.115E-5 0.18 AML other m 2020-10-21T01:25:28.38
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download