Earthquake with magnitude of ML 1.3 on date 22-09-2021 and time 13:10:34 (UTC) in region 5 km NW Palazzuolo sul Senio (FI)

A magnitude ML 1.3 earthquake occured in region: 5 km NW Palazzuolo sul Senio (FI), on

  • 22-09-2021 13:10:34 (UTC)
  • 22-09-2021 15:10:34 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.157, 11.517 at 9 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
Castel del Rio BO 6 1246 2400
Casola Valsenio RA 11 2617 5017
Fontanelice BO 12 1943 6960
Marradi FI 12 3139 10099
Firenzuola FI 12 4726 14825
Borgo Tossignano BO 15 3288 18113
Monghidoro BO 17 3749 21862
Casalfiumanese BO 18 3438 25300

Municipalities with at least 50000 inhabitants

An earthquake occurred to
27 Km SW of Imola (69797 inhabitants)
33 Km W of Faenza (58541 inhabitants)
40 Km SE of Bologna (386663 inhabitants)
43 Km W of Forlì (117913 inhabitants)
45 Km NE of Prato (191150 inhabitants)
48 Km NE of Firenze (382808 inhabitants)
52 Km NE of Scandicci (50609 inhabitants)
54 Km E of Pistoia (90315 inhabitants)
58 Km W of Cesena (96758 inhabitants)
62 Km W of Ravenna (159116 inhabitants)
72 Km SE of Modena (184973 inhabitants)
76 Km S of Ferrara (133155 inhabitants)
82 Km NW of Arezzo (99543 inhabitants)
84 Km W of Rimini (147750 inhabitants)
86 Km SE of Carpi (70699 inhabitants)
88 Km E of Lucca (89046 inhabitants)
93 Km SE of Reggio nell'Emilia (171345 inhabitants)
94 Km N of Siena (53903 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 1.3 2021-09-22
13:10:34
44.1573 11.5173 9 2021-09-22
13:14:36
Sala Sismica INGV-Roma 95741611
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-22 13:10:34 ± 0.17
Latitude 44.1573 ± 0.0072
Longitude 11.5173 ± 0.0100
Depth (km) 9 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 95741611

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 796
Semi-minor axis of confidence ellipse (meter) 362
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 128
Circular confidence region, given by single value of horizontal uncertainty (meter) 800
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 92
Number of associated phases, regardless of their use for origin computation 15
Number of defining phases 15
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.32
Epicentral distance of station closest to the epicenter (degree) 0.06745
Epicentral distance of station farthest from the epicenter (degree) 0.41009
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:1.3

Field Value
Value 1.3
Uncertainty 0.4
Num. used stations 12
Type of magnitude ML
Reference to an origin 95741611
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-22 13:14:36
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.MOCL.EHZ. 2021-09-22T13:10:45.85 0.6 undecidable manual S 238 0.286 50 0.1 49
IV.BOSL.HHZ. 2021-09-22T13:10:44.78 0.6 undecidable manual S 204 0.2482 109 0.26 48
IV.MTRZ.HHZ. 2021-09-22T13:10:42.68 0.3 undecidable manual S 337 0.1691 116 1 56
IV.BRIS.HHZ. 2021-09-22T13:10:42.52 0.6 undecidable manual S 69 0.1907 114 0.07 50
IV.ASQU.HHZ. 2021-09-22T13:10:42.90 1.0 undecidable manual P 151 0.4101 50 -0.19 23
IV.SEI.HHZ. 2021-09-22T13:10:41.57 0.6 undecidable manual S 228 0.1538 119 0.41 47
IV.LMD.HHZ. 2021-09-22T13:10:41.67 0.6 undecidable manual S 120 0.1583 118 0.37 47
IV.BOSL.HHZ. 2021-09-22T13:10:40.21 0.6 negative manual P 204 0.2482 109 -0.04 50
IV.MOCL.EHZ. 2021-09-22T13:10:40.79 1.0 positive manual P 238 0.286 50 -0.17 24
IV.SEI.HHZ. 2021-09-22T13:10:38.20 0.1 positive manual P 228 0.1538 119 -0.11 100
IV.LMD.HHZ. 2021-09-22T13:10:38.22 1.0 undecidable manual P 120 0.1583 118 -0.18 25
IV.MTRZ.HHZ. 2021-09-22T13:10:38.45 0.1 undecidable manual P 337 0.1691 116 -0.17 99
IV.BRIS.HHZ. 2021-09-22T13:10:38.74 0.6 positive manual P 69 0.1907 114 -0.32 48
IV.VISG.HHZ. 2021-09-22T13:10:37.86 0.6 undecidable manual S 298 0.0674 141 -0.7 43
IV.VISG.HHZ. 2021-09-22T13:10:36.24 0.6 undecidable manual P 298 0.0674 141 -0.57 46
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.VISG.HHE. ML:2.1 0.00209 0.16 AML other m 2021-09-22T13:10:37.89
IV.VISG.HHN. ML:2 0.00177 1.8 AML other m 2021-09-22T13:10:37.97
IV.SEI.HHN. ML:1.5 0.000258 0.26 AML other m 2021-09-22T13:10:41.87
IV.LMD.HHN. ML:0.8 6.005E-5 0.28 AML other m 2021-09-22T13:10:42.12
IV.MTRZ.HHN. ML:1.5 0.000234 0.3 AML other m 2021-09-22T13:10:43.78
IV.SEI.HHE. ML:1.3 0.0001785 0.24 AML other m 2021-09-22T13:10:43.97
IV.LMD.HHE. ML:0.8 5.19E-5 0.58 AML other m 2021-09-22T13:10:43.69
IV.BRIS.HHN. ML:1.3 0.0001455 0.78 AML other m 2021-09-22T13:10:44.28
IV.MTRZ.HHE. ML:1.4 0.000182 0.24 AML other m 2021-09-22T13:10:44.56
IV.BOSL.HHE. ML:0.6 2.215E-5 0.12 AML other m 2021-09-22T13:10:45.54
IV.BRIS.HHE. ML:1.3 0.0001395 0.8 AML other m 2021-09-22T13:10:46.64
IV.BOSL.HHN. ML:0.7 2.36E-5 0.34 AML other m 2021-09-22T13:10:48.19
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