Earthquake with magnitude of ML 1.5 on date 12-10-2021 and time 14:02:31 (UTC) in region 1 km W Marradi (FI)

A magnitude ML 1.5 earthquake occured in region: 1 km W Marradi (FI), on

  • 12-10-2021 14:02:31 (UTC)
  • 12-10-2021 16:02:31 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.078, 11.599 at 7 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
Marradi FI 1 3139 3139
Palazzuolo sul Senio FI 6 1154 4293
Tredozio FC 12 1212 5505
Portico e San Benedetto FC 16 756 6261
Casola Valsenio RA 16 2617 8878
San Godenzo FI 17 1167 10045
Castel del Rio BO 17 1246 11291
Modigliana FC 18 4560 15851
Premilcuore FC 18 799 16650
Firenzuola FI 18 4726 21376
Vicchio FI 19 8044 29420
Rocca San Casciano FC 20 1910 31330

Municipalities with at least 50000 inhabitants

An earthquake occurred to
32 Km SW of Imola (69797 inhabitants)
32 Km SW of Faenza (58541 inhabitants)
39 Km W of Forlì (117913 inhabitants)
44 Km NE of Firenze (382808 inhabitants)
46 Km E of Prato (191150 inhabitants)
49 Km NE of Scandicci (50609 inhabitants)
51 Km SE of Bologna (386663 inhabitants)
52 Km W of Cesena (96758 inhabitants)
57 Km E of Pistoia (90315 inhabitants)
61 Km SW of Ravenna (159116 inhabitants)
72 Km NW of Arezzo (99543 inhabitants)
77 Km W of Rimini (147750 inhabitants)
83 Km SE of Modena (184973 inhabitants)
84 Km S of Ferrara (133155 inhabitants)
87 Km N of Siena (53903 inhabitants)
92 Km E of Lucca (89046 inhabitants)
97 Km SE of Carpi (70699 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
Felt maps
Preliminary map of the earthquake effects from the web questionnaire

Preliminary map of the earthquake effects from the web 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 1.5 2021-10-12
14:02:31
44.0783 11.5993 7 2021-10-12
14:14:03
Sala Sismica INGV-Roma 96475871
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-12 14:02:31 ± 0.07
Latitude 44.0783 ± 0.0036
Longitude 11.5993 ± 0.0038
Depth (km) 7 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 96475871

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 342
Semi-minor axis of confidence ellipse (meter) 215
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 190
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) 86
Number of associated phases, regardless of their use for origin computation 22
Number of defining phases 22
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.24
Epicentral distance of station closest to the epicenter (degree) 0.07734
Epicentral distance of station farthest from the epicenter (degree) 0.5252
Number of stations at which the event was observed 11
Number of stations from which data was used for origin computation 11
Magnitude information

ML:1.5

Field Value
Value 1.5
Uncertainty 0.2
Num. used stations 8
Type of magnitude ML
Reference to an origin 96475871
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-12 14:14:03
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.CRE.HHZ. 2021-10-12T14:02:50.78 0.3 undecidable manual S 151 0.5252 50 0.35 66
IV.MPPT.EHE. 2021-10-12T14:02:46.01 0.6 undecidable manual S 252 0.3849 50 -0.29 45
IV.FNVD.HHE. 2021-10-12T14:02:45.32 0.3 undecidable manual S 285 0.3534 50 -0.03 72
IV.MOCL.EHE. 2021-10-12T14:02:43.73 0.3 undecidable manual S 256 0.3094 102 -0.03 73
IV.ASQU.HHZ. 2021-10-12T14:02:43.74 0.3 undecidable manual S 154 0.313 102 -0.16 71
IV.CRE.HHZ. 2021-10-12T14:02:42.23 0.6 undecidable manual P 151 0.5252 50 -0.23 45
IV.SFI.EHZ. 2021-10-12T14:02:41.56 0.3 undecidable manual S 134 0.2482 105 0.08 73
IV.RUFI.EHZ. 2021-10-12T14:02:41.70 0.1 undecidable manual S 195 0.2491 105 0.21 95
IV.MPPT.EHE. 2021-10-12T14:02:40.70 0.3 undecidable manual P 252 0.3849 50 0.62 62
IV.BRIS.HHZ. 2021-10-12T14:02:39.73 0.1 undecidable manual S 39 0.1889 109 0.45 91
IV.FNVD.HHE. 2021-10-12T14:02:39.11 0.1 undecidable manual P 285 0.3534 50 -0.42 89
IV.SEI.HHE. 2021-10-12T14:02:39.12 0.3 undecidable manual S 262 0.1745 110 0.37 70
IV.ASQU.HHZ. 2021-10-12T14:02:38.42 0.3 negative manual P 154 0.313 102 -0.27 70
IV.VISG.HHE. 2021-10-12T14:02:38.22 0.1 undecidable manual S 313 0.1619 112 -0.08 99
IV.MOCL.EHE. 2021-10-12T14:02:38.41 0.3 undecidable manual P 256 0.3094 102 -0.2 71
IV.SFI.EHZ. 2021-10-12T14:02:37.16 1.0 negative manual P 134 0.2482 105 -0.14 24
IV.RUFI.EHZ. 2021-10-12T14:02:37.30 0.1 undecidable manual P 195 0.2491 105 0 99
IV.BRIS.HHZ. 2021-10-12T14:02:36.04 0.1 positive manual P 39 0.1889 109 0.01 100
IV.VISG.HHE. 2021-10-12T14:02:35.36 0.1 undecidable manual P 313 0.1619 112 -0.1 99
IV.LMD.HHZ. 2021-10-12T14:02:35.28 0.1 undecidable manual S 91 0.0773 130 -0.2 98
IV.SEI.HHE. 2021-10-12T14:02:35.82 0.1 undecidable manual P 262 0.1745 110 0.1 99
IV.LMD.HHZ. 2021-10-12T14:02:33.69 0.1 positive manual P 91 0.0773 130 -0.14 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.BRIS.HHN. ML:1.6 0.0003175 0.28 AML other m 2021-10-12T14:02:39.92
IV.SFI.EHE. ML:1.2 8.875E-5 0.16 AML other m 2021-10-12T14:02:42.20
IV.SFI.EHN. ML:1.3 0.0001042 0.6 AML other m 2021-10-12T14:02:42.26
IV.ASQU.HHN. ML:1.6 0.000177 0.24 AML other m 2021-10-12T14:02:44.27
IV.ASQU.HHE. ML:1.4 0.00010985 0.82 AML other m 2021-10-12T14:02:44.53
IV.BRIS.HHE. ML:1.4 0.0002 0.34 AML other m 2021-10-12T14:02:44.96
IV.CRE.HHE. ML:1.4 5.595E-5 0.24 AML other m 2021-10-12T14:02:51.28
IV.CRE.HHN. ML:1.6 9.55E-5 0.18 AML other m 2021-10-12T14:02:51.57
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