Earthquake with magnitude of ML 1.1 on date 29-10-2021 and time 00:34:35 (UTC) in region 1 km W Firenzuola (FI)

A magnitude ML 1.1 earthquake occured in region: 1 km W Firenzuola (FI), on

  • 29-10-2021 00:34:35 (UTC)
  • 29-10-2021 02:34:35 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.119, 11.363 at 24 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
Firenzuola FI 1 4726 4726
Monghidoro BO 12 3749 8475
Palazzuolo sul Senio FI 15 1154 9629
San Benedetto Val di Sambro BO 15 4315 13944
Castel del Rio BO 16 1246 15190
Barberino di Mugello FI 16 10836 26026
Castiglione dei Pepoli BO 17 5648 31674
Loiano BO 17 4294 35968
Scarperia e San Piero FI 18 12217 48185
Vernio PO 18 6060 54245
Borgo San Lorenzo FI 18 18211 72456
Monzuno BO 19 6328 78784

Municipalities with at least 50000 inhabitants

An earthquake occurred to
34 Km NE of Prato (191150 inhabitants)
38 Km SW of Imola (69797 inhabitants)
40 Km N of Firenze (382808 inhabitants)
41 Km NE of Pistoia (90315 inhabitants)
42 Km S of Bologna (386663 inhabitants)
43 Km NE of Scandicci (50609 inhabitants)
46 Km W of Faenza (58541 inhabitants)
55 Km W of Forlì (117913 inhabitants)
68 Km SE of Modena (184973 inhabitants)
70 Km W of Cesena (96758 inhabitants)
75 Km W of Ravenna (159116 inhabitants)
75 Km E of Lucca (89046 inhabitants)
82 Km S of Ferrara (133155 inhabitants)
83 Km SE of Carpi (70699 inhabitants)
84 Km NW of Arezzo (99543 inhabitants)
87 Km SE of Reggio nell'Emilia (171345 inhabitants)
89 Km N of Siena (53903 inhabitants)
89 Km NE of Pisa (89158 inhabitants)
93 Km E of Viareggio (62467 inhabitants)
96 Km W of Rimini (147750 inhabitants)
98 Km E of Massa (69479 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 earthquake resentment in the area, expressed in terms of intensity on the MCS scale (Mercalli-Cancani-Sieberg). Intensities are determined using data from questionnaires collected on the website http://www.hsit.it. The intensities shown are determined considering all the reports received from each municipality, and are all the more reliable the greater the number of questionnaires. The collected data are subjected to an automatic statistical filter, but are not checked individually. In particular, intensities greater than or equal to the VI degree of the MCS or EMS scale require on-site verification by specialized personnel. The black star is the epicenter of the earthquake that occurred. This map is updated every time citizens fill out new questionnaires. The number of questionnaires processed to obtain this map, the date and time of the last update are shown at the top right.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100
ML 1.1 2021-10-29
00:34:35
44.1192 11.3627 24 2021-10-29
00:46:01
Sala Sismica INGV-Roma 97047811
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-29 00:34:35 ± 0.16
Latitude 44.1192 ± 0.0072
Longitude 11.3627 ± 0.0113
Depth (km) 24 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 97047811

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 959
Semi-minor axis of confidence ellipse (meter) 521
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 304
Circular confidence region, given by single value of horizontal uncertainty (meter) 960
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 196
Number of associated phases, regardless of their use for origin computation 7
Number of defining phases 7
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.12
Epicentral distance of station closest to the epicenter (degree) 0.08633
Epicentral distance of station farthest from the epicenter (degree) 0.30847
Number of stations at which the event was observed 4
Number of stations from which data was used for origin computation 4
Magnitude information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.3
Num. used stations 4
Type of magnitude ML
Reference to an origin 97047811
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-29 00:46:01
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.BRIS.HHZ. 2021-10-29T00:34:48.23 0.3 undecidable manual S 70 0.3085 119 0.02 73
IV.MTRZ.HHZ. 2021-10-29T00:34:45.63 0.1 undecidable manual S 13 0.1988 133 0.07 98
IV.VISG.HHZ. 2021-10-29T00:34:43.51 0.1 undecidable manual S 36 0.0863 156 -0.08 100
IV.BRIS.HHZ. 2021-10-29T00:34:42.88 0.1 undecidable manual P 70 0.3085 119 -0.03 97
IV.BOSL.HHZ. 2021-10-29T00:34:41.26 0.3 undecidable manual P 177 0.188 134 0.01 75
IV.MTRZ.HHZ. 2021-10-29T00:34:41.26 0.1 negative manual P 13 0.1988 133 -0.12 97
IV.VISG.HHZ. 2021-10-29T00:34:40.37 0.1 undecidable manual P 36 0.0863 156 0.13 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.VISG.HHE. ML:0.9 4.89E-5 0.52 AML other m 2021-10-29T00:34:43.61
IV.VISG.HHN. ML:0.8 4.14442655E-5 0.14 AML other m 2021-10-29T00:34:43.74
IV.MTRZ.HNE. ML:1.4 0.000105742535 0.99 AML other m 2021-10-29T00:34:46.41
IV.MTRZ.HNN. ML:1.4 0.000125505 0.59 AML other m 2021-10-29T00:34:45.71
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