Earthquake with magnitude of ML 1.2 on date 22-04-2021 and time 06:35:13 (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 06:35:13 (UTC)
  • 22-04-2021 08:35:13 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.1300, 11.5020 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.

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
Castel del Rio BO 9 1246 2400
Firenzuola FI 10 4726 7126
Marradi FI 11 3139 10265
Casola Valsenio RA 14 2617 12882
Fontanelice BO 15 1943 14825
Monghidoro BO 18 3749 18574
Borgo Tossignano BO 18 3288 21862

Municipalities with at least 50000 inhabitants

An earthquake occurred to
30 Km SW of Imola (69797 inhabitants)
35 Km W of Faenza (58541 inhabitants)
43 Km NE of Prato (191150 inhabitants)
43 Km SE of Bologna (386663 inhabitants)
44 Km W of Forlì (117913 inhabitants)
45 Km NE of Firenze (382808 inhabitants)
49 Km NE of Scandicci (50609 inhabitants)
52 Km E of Pistoia (90315 inhabitants)
59 Km W of Cesena (96758 inhabitants)
64 Km W of Ravenna (159116 inhabitants)
73 Km SE of Modena (184973 inhabitants)
79 Km S of Ferrara (133155 inhabitants)
80 Km NW of Arezzo (99543 inhabitants)
85 Km W of Rimini (147750 inhabitants)
86 Km E of Lucca (89046 inhabitants)
88 Km SE of Carpi (70699 inhabitants)
91 Km N of Siena (53903 inhabitants)
94 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
06:35:13
44.1298 11.502 10 2021-04-22
06:44:41
Sala Sismica INGV-Roma 89349521
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-04-22 06:35:13 ± 0.05
Latitude 44.1298 ± 0.0027
Longitude 11.5020 ± 0.0050
Depth (km) 10 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 89349521

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 375
Semi-minor axis of confidence ellipse (meter) 320
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 306
Circular confidence region, given by single value of horizontal uncertainty (meter) 380.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 80
Number of associated phases, regardless of their use for origin computation 17
Number of defining phases 17
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.13
Epicentral distance of station closest to the epicenter (degree) 0.07644
Epicentral distance of station farthest from the epicenter (degree) 0.39210
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 0.3
Num. used stations 16
Type of magnitude ML
Reference to an origin 89349521
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-04-22 06:44:41
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.ASQU.HHZ. 2021-04-22T06:35:27.46 0.3 undecidable manual S 148 43.5231 50 0.12 70
IV.SFI.EHZ. 2021-04-22T06:35:25.79 0.6 undecidable manual S 132 37.1295 50 0.14 47
IV.RINC.HHZ. 2021-04-22T06:35:23.20 0.6 undecidable manual S 163 28.2495 50 -0.07 48
IV.ASQU.HHZ. 2021-04-22T06:35:21.26 0.6 positive manual P 148 43.5231 50 -0.06 47
IV.SFI.EHZ. 2021-04-22T06:35:20.25 1.0 positive manual P 132 37.1295 50 -0.09 24
IV.RUFI.EHZ. 2021-04-22T06:35:19.42 1.0 positive manual P 179 32.3454 50 -0.19 23
IV.RONT.HHZ. 2021-04-22T06:35:19.71 0.3 undecidable manual S 200 16.0728 123 -0.03 75
IV.SEI.HHZ. 2021-04-22T06:35:19.24 0.3 undecidable manual S 234 14.1747 126 0.05 74
IV.MOCL.EHZ. 2021-04-22T06:35:19.15 0.3 negative manual P 242 29.1486 50 0.05 73
IV.BRIS.HHZ. 2021-04-22T06:35:18.52 0.3 positive manual P 63 23.5542 50 0.27 69
IV.RINC.HHZ. 2021-04-22T06:35:18.84 0.3 undecidable manual P 163 28.2495 50 -0.14 71
IV.VISG.HHZ. 2021-04-22T06:35:17.73 0.3 undecidable manual S 321 8.4804 141 -0.02 76
IV.MTRZ.HNZ. 2021-04-22T06:35:17.25 1.0 undecidable manual P 343 21.1677 116 -0.58 21
IV.RONT.HHZ. 2021-04-22T06:35:17.02 0.1 positive manual P 200 16.0728 123 0.08 98
IV.LMD.HHZ. 2021-04-22T06:35:16.96 0.1 positive manual P 109 17.3715 121 -0.19 97
IV.SEI.HHZ. 2021-04-22T06:35:16.61 0.1 positive manual P 234 14.1747 126 -0.01 100
IV.VISG.HHZ. 2021-04-22T06:35:15.87 0.1 undecidable manual P 321 8.4804 141 0.08 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.VISG.HHN. ML:1.5 0.00041049999999999995 1.66 AML other m 2021-04-22T06:35:17.01
IV.VISG.HHE. ML:1.4 0.000321 0.22 AML other m 2021-04-22T06:35:18.62
IV.SEI.HHE. ML:1.8 0.00061 0.2 AML other m 2021-04-22T06:35:19.34
IV.SEI.HHN. ML:2.1 0.001345 0.18 AML other m 2021-04-22T06:35:19.46
IV.RONT.HHE. ML:1.8 0.0005105 0.32 AML other m 2021-04-22T06:35:19.83
IV.RONT.HHN. ML:1.7 0.0004625 0.2 AML other m 2021-04-22T06:35:20.41
IV.LMD.HHE. ML:1.1 0.0001003 0.42 AML other m 2021-04-22T06:35:21.78
IV.LMD.HHN. ML:1.1 0.0001001 0.6 AML other m 2021-04-22T06:35:23.55
IV.MOCL.EHE. ML:1.0 0.00005705 0.22 AML other m 2021-04-22T06:35:24.59
IV.MOCL.EHN. ML:1.0 0.000054550000000000005 1.54 AML other m 2021-04-22T06:35:24.88
IV.BRIS.HHE. ML:1.1 0.0000839 1.58 AML other m 2021-04-22T06:35:26.97
IV.SFI.EHN. ML:1.0 0.0000367 0.24 AML other m 2021-04-22T06:35:26.30
IV.BRIS.HHN. ML:1.2 0.0001023 0.6 AML other m 2021-04-22T06:35:26.58
IV.SFI.EHE. ML:1.0 0.0000389 0.34 AML other m 2021-04-22T06:35:26.70
IV.ASQU.HHE. ML:1.0 0.0000296 1.02 AML other m 2021-04-22T06:35:27.58
IV.ASQU.HHN. ML:1.0 0.00002825 0.84 AML other m 2021-04-22T06:35:28.47
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