Earthquake with magnitude of ML 1.4 on date 22-08-2021 and time 21:01:38 (Italy) in region 5 km W Premilcuore (FC)

A magnitude ML 1.4 earthquake occured in region: 5 km W Premilcuore (FC), on

  • 22-08-2021 19:01:38 (UTC)
  • 22-08-2021 21:01:38 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.956, 11.719 at 11 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
Premilcuore FC 5 799 799
San Godenzo FI 9 1167 1966
Portico e San Benedetto FC 9 756 2722
Tredozio FC 14 1212 3934
Santa Sofia FC 15 4136 8070
Rocca San Casciano FC 15 1910 9980
Marradi FI 16 3139 13119
Londa FI 16 1840 14959
Galeata FC 16 2516 17475
Dicomano FI 17 5515 22990
Civitella di Romagna FC 19 3786 26776
Pratovecchio Stia AR 19 5845 32621

Municipalities with at least 50000 inhabitants

An earthquake occurred to
39 Km SW of Faenza (58541 inhabitants)
39 Km SW of Forlì (117913 inhabitants)
42 Km E of Firenze (382808 inhabitants)
44 Km S of Imola (69797 inhabitants)
47 Km W of Cesena (96758 inhabitants)
48 Km E of Scandicci (50609 inhabitants)
50 Km E of Prato (191150 inhabitants)
56 Km N of Arezzo (99543 inhabitants)
64 Km E of Pistoia (90315 inhabitants)
64 Km SW of Ravenna (159116 inhabitants)
67 Km SE of Bologna (386663 inhabitants)
69 Km W of Rimini (147750 inhabitants)
77 Km NE of Siena (53903 inhabitants)
96 Km W of Pesaro (94582 inhabitants)
98 Km S of Ferrara (133155 inhabitants)
98 Km E of Lucca (89046 inhabitants)
99 Km SE of Modena (184973 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 1.4 2021-08-22
19:01:38
43.9565 11.7187 11 2021-08-22
19:09:21
Sala Sismica INGV-Roma 94512471
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-08-22 19:01:38 ± 0.05
Latitude 43.9565 ± 0.0027
Longitude 11.7187 ± 0.0062
Depth (km) 11 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 94512471

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 485
Semi-minor axis of confidence ellipse (meter) 294
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 74
Circular confidence region, given by single value of horizontal uncertainty (meter) 480
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 112
Number of associated phases, regardless of their use for origin computation 17
Number of defining phases 14
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.17
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.37682
Number of stations at which the event was observed 10
Number of stations from which data was used for origin computation 7
Magnitude information

ML:1.4

Field Value
Value 1.4
Uncertainty 0.3
Num. used stations 16
Type of magnitude ML
Reference to an origin 94512471
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-08-22 19:09:21
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
TV.SF04.EHZ. 2021-08-22T19:01:57.13 3.0 positive manual P 0.33 0
IV.CRE.HHZ. 2021-08-22T19:01:52.33 0.3 undecidable manual S 153 0.3768 50 -0.22 69
IV.SEI.HHZ. 2021-08-22T19:01:49.80 0.3 undecidable manual S 291 0.277 50 0.22 71
IV.BRIS.HHZ. 2021-08-22T19:01:49.62 0.3 undecidable manual S 7 0.2698 50 0.23 71
IV.BOSL.HHZ. 2021-08-22T19:01:48.83 0.3 undecidable manual S 264 0.2491 50 0.07 73
IV.CPGN.EHZ. 2021-08-22T19:01:48.89 3.0 undecidable manual S 0.08 0
IV.ASQU.HHZ. 2021-08-22T19:01:46.49 0.3 undecidable manual S 162 0.1673 50 0.14 73
IV.CRE.HHZ. 2021-08-22T19:01:46.61 0.1 undecidable manual P 153 0.3768 50 -0.17 93
IV.FIR.HHZ. 2021-08-22T19:01:45.49 3.0 undecidable manual P -1.52 0
IV.BRIS.HHZ. 2021-08-22T19:01:44.97 0.1 undecidable manual P 7 0.2698 50 0.02 99
IV.LMD.HHZ. 2021-08-22T19:01:44.66 0.3 undecidable manual S 356 0.1214 129 -0.25 73
IV.BOSL.HHZ. 2021-08-22T19:01:44.66 0.1 undecidable manual P 264 0.2491 50 0.07 98
IV.SFI.EHZ. 2021-08-22T19:01:44.64 0.3 undecidable manual S 119 0.1061 133 0.18 73
IV.SEI.HHZ. 2021-08-22T19:01:44.81 0.1 undecidable manual P 291 0.277 50 -0.25 94
IV.ASQU.HHZ. 2021-08-22T19:01:43.22 0.1 undecidable manual P 162 0.1673 50 0.02 100
IV.SFI.EHZ. 2021-08-22T19:01:42.17 0.1 undecidable manual P 119 0.1061 133 0.07 100
IV.LMD.HHZ. 2021-08-22T19:01:42.13 1.0 undecidable manual P 356 0.1214 129 -0.23 24
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SFI.HNE. ML:1.4 0.0003115 0.08 AML other m 2021-08-22T19:01:44.72
IV.SFI.EHE. ML:1.5 0.0003228079 0.0768 AML other m 2021-08-22T19:01:44.72
IV.LMD.HHE. ML:1.7 0.0004850526 0.2304 AML other m 2021-08-22T19:01:44.85
IV.LMD.HHN. ML:2 0.0009905 0.14 AML other m 2021-08-22T19:01:44.77
IV.SFI.HNN. ML:1.5 0.0003532101 0.1536 AML other m 2021-08-22T19:01:44.78
IV.SFI.EHN. ML:1.5 0.0003427678 0.1408 AML other m 2021-08-22T19:01:44.79
IV.ASQU.HHE. ML:1 7.165E-5 1.24 AML other m 2021-08-22T19:01:47.77
IV.ASQU.HHN. ML:0.9 6.055E-5 0.26 AML other m 2021-08-22T19:01:47.03
IV.BOSL.HHN. ML:0.6 1.885E-5 0.24 AML other m 2021-08-22T19:01:49.57
IV.BOSL.HHE. ML:0.5 1.73909335E-5 0.192 AML other m 2021-08-22T19:01:49.68
IV.BRIS.HHE. ML:1.4 0.0001105 0.28 AML other m 2021-08-22T19:01:49.71
IV.BRIS.HHN. ML:1.3 9.9E-5 1.7 AML other m 2021-08-22T19:01:50.12
IV.CRE.HHE. ML:0.9 2.375E-5 0.58 AML other m 2021-08-22T19:01:55.51
IV.CRE.HHN. ML:1.1 3.82E-5 0.28 AML other m 2021-08-22T19:01:55.89
IV.BRIS.HNE. ML:1.3 8.8735875E-5 0.6528 AML other m 2021-08-22T19:02:00.56
IV.BRIS.HNN. ML:1.5 0.00015618505 1.216 AML other m 2021-08-22T19:01:56.56
TV.SF04.EHE. ML:1.2 1.013419E-5 1.3568 AML other m 2021-08-22T19:02:14.37
TV.SF04.EHN. ML:1.8 3.8980623E-5 0.2176 AML other m 2021-08-22T19:01:59.11
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