Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.2 on date 22-04-2021 and time 07:43:44 (UTC) in region 4 km W Palazzuolo sul Senio (FI)

A magnitude ML 1.2 earthquake occured in region: 4 km W Palazzuolo sul Senio (FI), on

  • 22-04-2021 07:43:44 (UTC)
  • 22-04-2021 09:43:44 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.1200, 11.5040 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.

Hai sentito il terremoto? Clicca qui

Did you feel it? Fill in the questionnaire.

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 4 1154 1154
Firenzuola FI 10 4726 5880
Marradi FI 10 3139 9019
Castel del Rio BO 10 1246 10265
Casola Valsenio RA 15 2617 12882
Fontanelice BO 16 1943 14825
Monghidoro BO 19 3749 18574
Borgo Tossignano BO 19 3288 21862
Tredozio FC 20 1212 23074

Municipalities with at least 50000 inhabitants

An earthquake occurred to
31 Km SW of Imola (69797 inhabitants)
35 Km SW of Faenza (58541 inhabitants)
42 Km NE of Prato (191150 inhabitants)
44 Km SE of Bologna (386663 inhabitants)
44 Km NE of Firenze (382808 inhabitants)
44 Km W of Forlì (117913 inhabitants)
48 Km NE of Scandicci (50609 inhabitants)
51 Km E of Pistoia (90315 inhabitants)
59 Km W of Cesena (96758 inhabitants)
65 Km SW of Ravenna (159116 inhabitants)
74 Km SE of Modena (184973 inhabitants)
79 Km NW of Arezzo (99543 inhabitants)
80 Km S of Ferrara (133155 inhabitants)
85 Km W of Rimini (147750 inhabitants)
86 Km E of Lucca (89046 inhabitants)
89 Km SE of Carpi (70699 inhabitants)
90 Km N of Siena (53903 inhabitants)
95 Km SE of Reggio nell'Emilia (171345 inhabitants)
99 Km E of Pisa (89158 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100 		ML 1.2 2021-04-22
07:43:44		 44.1205 11.504 11 2021-04-22
07:51:24		 Sala Sismica INGV-Roma 89350311
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-04-22 07:43:44 ± 0.06
Latitude 44.1205 ± 0.0045
Longitude 11.5040 ± 0.0050
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 89350311

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 439
Semi-minor axis of confidence ellipse (meter) 370
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 337
Circular confidence region, given by single value of horizontal uncertainty (meter) 440.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 97
Number of associated phases, regardless of their use for origin computation 20
Number of defining phases 20
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.19
Epicentral distance of station closest to the epicenter (degree) 0.08454
Epicentral distance of station farthest from the epicenter (degree) 0.38311
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:1.2

Field Value
Value 1.2
Uncertainty 0.2
Num. used stations 14
Type of magnitude ML
Reference to an origin 89350311
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-04-22 07:51:24
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.ASQU.HHZ. 2021-04-22T07:43:58.29 0.6 undecidable manual S 148 42.5241 50 0.22 46
IV.SFI.EHZ. 2021-04-22T07:43:56.59 0.6 undecidable manual S 131 36.3414 50 0.17 46
IV.MOCL.EHZ. 2021-04-22T07:43:54.73 0.6 undecidable manual S 244 28.749 50 0.34 46
IV.RUFI.EHZ. 2021-04-22T07:43:54.62 0.6 undecidable manual S 179 31.3464 50 -0.46 43
IV.BRIS.HHZ. 2021-04-22T07:43:53.73 0.6 undecidable manual S 61 23.8539 50 0.65 42
IV.RINC.HHZ. 2021-04-22T07:43:53.88 0.6 undecidable manual S 162 27.2505 50 -0.1 47
IV.ASQU.HHZ. 2021-04-22T07:43:52.05 1.0 negative manual P 148 42.5241 50 -0.13 23
IV.SFI.EHZ. 2021-04-22T07:43:51.02 1.0 negative manual P 131 36.3414 50 -0.21 23
IV.SEI.HHZ. 2021-04-22T07:43:50.24 0.3 undecidable manual S 238 13.6752 127 0.11 72
IV.MOCL.EHZ. 2021-04-22T07:43:50.12 0.1 positive manual P 244 28.749 50 0.06 97
IV.FNVD.HHZ. 2021-04-22T07:43:50.32 0.3 undecidable manual P 280 30.747 50 -0.05 70
IV.RUFI.EHZ. 2021-04-22T07:43:50.26 0.6 negative manual P 179 31.3464 50 -0.19 46
IV.RONT.HHZ. 2021-04-22T07:43:50.65 0.3 undecidable manual S 202 15.1737 125 0.11 71
IV.BRIS.HHZ. 2021-04-22T07:43:49.44 0.1 positive manual P 61 23.8539 50 0.14 95
IV.RINC.HHZ. 2021-04-22T07:43:49.74 1.0 undecidable manual P 162 27.2505 50 -0.08 24
IV.VISG.HHZ. 2021-04-22T07:43:48.75 0.3 undecidable manual S 324 9.3795 138 -0.28 71
IV.RONT.HHZ. 2021-04-22T07:43:47.95 0.1 positive manual P 202 15.1737 125 0.12 96
IV.SEI.HHZ. 2021-04-22T07:43:47.60 0.1 positive manual P 238 13.6752 127 0 99
IV.LMD.HHZ. 2021-04-22T07:43:47.81 0.1 positive manual P 106 16.872 122 -0.31 94
IV.VISG.HHZ. 2021-04-22T07:43:46.95 0.1 negative manual P 324 9.3795 138 -0.01 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.VISG.HHE. ML:1.6 0.0004689782 0.16 AML other m 2021-04-22T07:43:49.02
IV.VISG.HHN. ML:1.6 0.0004718015999999999 0.384 AML other m 2021-04-22T07:43:50.20
IV.LMD.HHN. ML:1.0 0.00009309553000000001 0.2752 AML other m 2021-04-22T07:43:53.04
IV.LMD.HHE. ML:1.1 0.00011149999999999999 0.26 AML other m 2021-04-22T07:43:53.39
IV.BRIS.HHN. ML:1.4 0.0001385 0.26 AML other m 2021-04-22T07:43:54.14
IV.RINC.HHE. ML:1.0 0.000060899999999999996 0.28 AML other m 2021-04-22T07:43:54.51
IV.MOCL.EHE. ML:1.2 0.0000746 1.28 AML other m 2021-04-22T07:43:55.15
IV.MOCL.EHN. ML:1.1 0.0000713 0.16 AML other m 2021-04-22T07:43:55.27
IV.RINC.HHN. ML:1.0 0.0000571 0.76 AML other m 2021-04-22T07:43:55.00
IV.SFI.EHN. ML:1.1 0.00004375 1.86 AML other m 2021-04-22T07:43:57.99
IV.SFI.EHE. ML:1.2 0.0000526 0.92 AML other m 2021-04-22T07:43:57.43
IV.ASQU.HHE. ML:1.0 0.00003585 0.8 AML other m 2021-04-22T07:43:58.37
IV.BRIS.HHE. ML:1.4 0.00014050000000000003 0.42 AML other m 2021-04-22T07:43:58.65
IV.ASQU.HHN. ML:1.0 0.000033549999999999996 1.76 AML other m 2021-04-22T07:43:59.02
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