Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.8 on date 25-10-2021 and time 19:12:16 (Italy) in region 5 km SE Pieve Santo Stefano (AR)

A magnitude ML 1.8 earthquake occured in region: 5 km SE Pieve Santo Stefano (AR), on

  • 25-10-2021 17:12:16 (UTC)
  • 25-10-2021 19:12:16 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.6340, 12.0690 at 10 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

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.

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Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Pieve Santo Stefano AR 5 3183 3183
Caprese Michelangelo AR 7 1426 4609
Sansepolcro AR 9 15884 20493
Anghiari AR 10 5638 26131
Badia Tedalda AR 13 1087 27218
San Giustino PG 13 11297 38515
Chiusi della Verna AR 13 2023 40538
Citerna PG 15 3531 44069
Chitignano AR 16 899 44968
Monterchi AR 17 1757 46725
Subbiano AR 17 6331 53056
Borgo Pace PU 18 606 53662
Capolona AR 19 5438 59100
Verghereto FC 19 1907 61007
Castel Focognano AR 19 3149 64156
Casteldelci RN 19 407 64563

Municipalities with at least 50000 inhabitants

An earthquake occurred to
24 Km NE of Arezzo (99543 inhabitants)
58 Km S of Cesena (96758 inhabitants)
62 Km SW of Rimini (147750 inhabitants)
64 Km NW of Perugia (166134 inhabitants)
66 Km S of Forlì (117913 inhabitants)
67 Km E of Firenze (382808 inhabitants)
69 Km NE of Siena (53903 inhabitants)
73 Km E of Scandicci (50609 inhabitants)
74 Km S of Faenza (58541 inhabitants)
75 Km W of Pesaro (94582 inhabitants)
80 Km W of Fano (60888 inhabitants)
83 Km E of Prato (191150 inhabitants)
85 Km SE of Imola (69797 inhabitants)
88 Km S of Ravenna (159116 inhabitants)
91 Km NW of Foligno (57155 inhabitants)
98 Km E of Pistoia (90315 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
Bulletin
Rev1000 		ML 1.8 2021-10-25
17:12:16		 43.6337 12.0692 10 2022-03-30
13:04:14		 Bollettino Sismico Italiano INGV 97168241
Reviewed
Rev100 		ML 1.9 2021-10-25
17:12:16		 43.6372 12.0753 10 2021-10-25
17:33:25		 Sala Sismica INGV-Roma 96985861
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-25 17:12:16 ± 0.05
Latitude 43.6337 ± 0.0027
Longitude 12.0692 ± 0.0037
Depth (km) 10 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 97168241

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 363
Semi-minor axis of confidence ellipse (meter) 229
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 212
Circular confidence region, given by single value of horizontal uncertainty (meter) 360.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 67
Number of associated phases, regardless of their use for origin computation 64
Number of defining phases 63
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.2
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.80849
Number of stations at which the event was observed 39
Number of stations from which data was used for origin computation 38
Magnitudes information

ML:1.8

Field Value
Value 1.8
Uncertainty 0.2
Num. used stations 28
Type of magnitude ML
Reference to an origin 97168241
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-11-02 13:15:10

ML:1.9

Field Value
Value 1.9
Uncertainty 0.3
Num. used stations 50
Type of magnitude ML
Reference to an origin 96985861
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-25 17:33:25
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.BRSN.EHE. 2021-10-25T17:12:37.32 3.0 undecidable manual S -2.91 0
IV.CRTC.HHZ. 2021-10-25T17:12:37.61 0.3 undecidable manual S 77 66.9774 50 0.58 60
IV.MPAG.EHZ. 2021-10-25T17:12:34.16 0.6 undecidable manual S 90 55.4001 50 0.21 45
IV.FRON.EHZ. 2021-10-25T17:12:33.94 0.3 undecidable manual S 103 54.3012 50 0.29 67
IV.EL6.EHZ. 2021-10-25T17:12:32.24 0.6 undecidable manual P 112 89.7435 50 0.43 40
IV.RUFI.EHZ. 2021-10-25T17:12:32.99 0.6 undecidable manual S 297 50.2164 50 0.42 43
IV.ATLO.EHE. 2021-10-25T17:12:31.27 0.3 undecidable manual S 142 44.622 50 0.21 69
IV.ATBU.EHZ. 2021-10-25T17:12:31.09 0.6 undecidable manual S 114 42.3243 50 0.64 41
IV.TB01.DHZ.01 2021-10-25T17:12:30.31 0.6 undecidable manual S 133 40.626 50 0.3 45
IV.MGAB.HHZ. 2021-10-25T17:12:30.70 0.6 undecidable manual P 177 80.0643 50 0.38 41
IV.ATVA.EHE. 2021-10-25T17:12:30.33 0.6 undecidable manual S 156 43.0236 50 -0.32 45
IV.PIEI.HHZ. 2021-10-25T17:12:29.40 0.6 undecidable manual S 106 39.0276 50 -0.16 47
IV.ARVD.HHZ. 2021-10-25T17:12:29.40 0.6 undecidable manual P 102 71.6727 50 0.36 42
IV.NARO.HHZ. 2021-10-25T17:12:29.79 0.6 undecidable manual S 93 41.1255 50 -0.35 45
IV.TB03.DHZ.01 2021-10-25T17:12:29.31 0.6 undecidable manual S 133 37.629 50 0.1 48
IV.ATMI.HHZ. 2021-10-25T17:12:29.04 0.6 undecidable manual S 154 36.8298 50 0.04 48
IV.BRIS.HHZ. 2021-10-25T17:12:28.87 0.6 undecidable manual P 340 69.8745 50 0.12 45
IV.ATPI.EHZ. 2021-10-25T17:12:28.05 0.6 undecidable manual S 127 33.6441 50 -0.08 48
IV.PE3.EHZ. 2021-10-25T17:12:28.94 0.6 undecidable manual S 78 34.9428 50 0.45 44
IV.CRTC.HHZ. 2021-10-25T17:12:28.53 0.6 undecidable manual P 77 66.9774 50 0.23 44
IV.ATPC.HHE. 2021-10-25T17:12:28.80 0.6 undecidable manual S 118 35.5422 50 0.17 47
IV.SFI.EHZ. 2021-10-25T17:12:28.58 0.3 undecidable manual S 329 34.9428 50 0.09 72
IV.COR1.EHN. 2021-10-25T17:12:28.91 1.0 undecidable manual P 90 74.7696 50 -0.6 20
IV.CAFI.HHZ. 2021-10-25T17:12:28.51 0.6 undecidable manual S 194 34.743 50 0.07 48
IV.SSFR.HHZ. 2021-10-25T17:12:27.29 0.6 undecidable manual P 111 61.3941 50 -0.16 45
IV.APEC.HHZ. 2021-10-25T17:12:27.11 0.6 undecidable manual S 106 29.3484 50 0.11 48
IV.CSNT.HHZ. 2021-10-25T17:12:27.85 0.6 undecidable manual P 254 65.0904 50 -0.17 45
IV.ASQU.HHE. 2021-10-25T17:12:26.53 0.3 undecidable manual S 309 28.8489 50 -0.32 69
IV.MURB.HHZ. 2021-10-25T17:12:26.74 0.3 undecidable manual P 138 55.1004 50 0.26 67
IV.FRON.EHZ. 2021-10-25T17:12:26.06 0.3 undecidable manual P 103 54.3012 50 -0.29 67
IV.LMD.HHE. 2021-10-25T17:12:26.80 0.6 undecidable manual P 330 57.0984 50 0.02 47
IV.ATSC.EHE. 2021-10-25T17:12:26.51 0.6 undecidable manual P 115 54.8007 50 0.08 46
IV.MPAG.EHZ. 2021-10-25T17:12:26.28 0.3 undecidable manual P 90 55.4001 50 -0.25 67
IV.RUFI.EHZ. 2021-10-25T17:12:25.96 0.3 undecidable manual P 297 50.2164 50 0.23 68
IV.ATFO.HHE. 2021-10-25T17:12:25.77 0.6 undecidable manual P 126 50.1165 50 0.06 47
IV.ATBU.EHZ. 2021-10-25T17:12:24.44 0.3 undecidable manual P 114 42.3243 50 -0.06 71
IV.ATVA.EHE. 2021-10-25T17:12:24.27 0.3 undecidable manual P 156 43.0236 50 -0.35 67
IV.ATMC.EHZ. 2021-10-25T17:12:24.80 0.3 undecidable manual S 154 22.9548 113 -0.23 71
IV.ATLO.EHE. 2021-10-25T17:12:24.75 0.3 undecidable manual P 142 44.622 50 -0.11 71
IV.TB01.DHZ.01 2021-10-25T17:12:24.17 0.6 undecidable manual P 133 40.626 50 -0.08 48
IV.BADI.EHZ. 2021-10-25T17:12:24.01 0.3 undecidable manual S 134 19.6692 116 0.03 75
IV.CAFI.HHZ. 2021-10-25T17:12:23.34 0.3 undecidable manual P 194 34.743 50 0 73
IV.NARO.HHZ. 2021-10-25T17:12:23.88 0.3 undecidable manual P 93 41.1255 50 -0.45 66
IV.TB03.DHZ.01 2021-10-25T17:12:23.73 0.3 undecidable manual P 133 37.629 50 -0.06 72
IV.ATMI.HHZ. 2021-10-25T17:12:23.49 0.1 undecidable manual P 154 36.8298 50 -0.18 94
IV.PE3.EHZ. 2021-10-25T17:12:23.46 0.3 undecidable manual P 78 34.9428 50 0.09 72
IV.ATPC.HHE. 2021-10-25T17:12:23.27 0.3 undecidable manual P 118 35.5422 50 -0.19 71
IV.SFI.EHZ. 2021-10-25T17:12:23.07 0.3 undecidable manual P 329 34.9428 50 -0.3 69
IV.PIEI.HHZ. 2021-10-25T17:12:23.58 0.3 undecidable manual P 106 39.0276 50 -0.41 67
IV.ASQU.HHE. 2021-10-25T17:12:22.09 0.3 undecidable manual P 309 28.8489 50 -0.33 69
IV.ATPI.EHZ. 2021-10-25T17:12:22.93 0.3 undecidable manual P 127 33.6441 50 -0.23 70
IV.APEC.HHZ. 2021-10-25T17:12:22.28 0.3 undecidable manual P 106 29.3484 50 -0.23 71
IV.CPGN.EHZ. 2021-10-25T17:12:22.50 0.3 undecidable manual P 47 27.4503 109 0.3 70
IV.CDCA.HNZ. 2021-10-25T17:12:21.31 0.6 undecidable manual P 146 23.5542 112 -0.16 48
IV.CRE.HHZ. 2021-10-25T17:12:21.29 0.1 undecidable manual S 260 9.5793 135 0.2 98
IV.PARC.HHZ. 2021-10-25T17:12:21.77 0.3 undecidable manual S 83 13.6752 125 -0.42 69
IT.SNS1.HNZ. 2021-10-25T17:12:21.13 0.6 undecidable manual S 143 8.3805 139 0.33 48
IV.ATMC.EHZ. 2021-10-25T17:12:21.25 0.1 undecidable manual P 154 22.9548 113 -0.12 97
IV.SSP9.EHZ. 2021-10-25T17:12:20.96 0.3 undecidable manual S 143 8.2806 139 0.17 74
IV.BADI.EHZ. 2021-10-25T17:12:20.76 0.1 undecidable manual P 134 19.6692 116 -0.01 100
IT.SNS1.HNZ. 2021-10-25T17:12:19.15 0.3 undecidable manual P 143 8.3805 139 0.22 74
IV.SSP9.EHZ. 2021-10-25T17:12:19.05 0.3 undecidable manual P 143 8.2806 139 0.12 75
IV.CRE.HHZ. 2021-10-25T17:12:19.31 0.1 undecidable manual P 260 9.5793 135 0.21 98
IV.PARC.HHZ. 2021-10-25T17:12:19.65 0.3 undecidable manual P 83 13.6752 125 -0.09 74
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SSP9.EHN. ML:2.0 0.001405 0.2 AML other m 2021-10-25T17:12:21.04
IV.SSP9.EHE. ML:2.0 0.0013865 0.38 AML other m 2021-10-25T17:12:21.15
IV.BADI.EHE. ML:1.7 0.00039150000000000003 1.58 AML other m 2021-10-25T17:12:24.20
IV.BADI.EHN. ML:1.7 0.0004125 1.64 AML other m 2021-10-25T17:12:27.11
IV.CPGN.EHN. ML:1.8 0.0003205 0.88 AML other m 2021-10-25T17:12:28.33
IV.ATPI.EHN. ML:1.6 0.000175 1.54 AML other m 2021-10-25T17:12:28.83
IV.CAFI.HHE. ML:1.7 0.0001835 0.44 AML other m 2021-10-25T17:12:29.45
IV.CAFI.HHN. ML:1.8 0.000256 0.52 AML other m 2021-10-25T17:12:29.80
IV.ATPI.EHE. ML:1.7 0.000202 0.38 AML other m 2021-10-25T17:12:29.93
IV.CPGN.HNE. ML:2.0 0.00047999999999999996 0.88 AML other m 2021-10-25T17:12:30.54
IV.CPGN.HNN. ML:2.0 0.0006435 0.92 AML other m 2021-10-25T17:12:30.56
IV.NARO.HHN. ML:2.0 0.0003235 0.14 AML other m 2021-10-25T17:12:30.56
IV.CPGN.EHE. ML:1.9 0.0003925 0.4 AML other m 2021-10-25T17:12:31.32
IV.ATMI.HHN. ML:1.8 0.00022499999999999997 0.42 AML other m 2021-10-25T17:12:31.58
IV.NARO.HHE. ML:1.7 0.0001685 0.64 AML other m 2021-10-25T17:12:32.46
IV.ATFO.HHE. ML:1.8 0.000183 0.22 AML other m 2021-10-25T17:12:34.26
IV.FRON.EHN. ML:2.0 0.000222 0.28 AML other m 2021-10-25T17:12:34.75
IV.ATFO.HHN. ML:1.9 0.0002235 0.52 AML other m 2021-10-25T17:12:35.41
IV.FRON.EHE. ML:1.7 0.000117 0.24 AML other m 2021-10-25T17:12:35.47
IV.ATMI.HHE. ML:1.8 0.0002475 0.34 AML other m 2021-10-25T17:12:37.68
IV.MURB.HHE. ML:2.1 0.0003035 0.22 AML other m 2021-10-25T17:12:39.44
IV.MURB.HHN. ML:2.1 0.00028900000000000003 0.24 AML other m 2021-10-25T17:12:40.30
IV.CSNT.HHN. ML:1.6 0.00006654999999999999 1.2 AML other m 2021-10-25T17:12:40.72
IV.CSNT.HHE. ML:1.8 0.0001175 0.3 AML other m 2021-10-25T17:12:41.52
IV.BRIS.HHE. ML:1.7 0.0000814 1.6 AML other m 2021-10-25T17:12:43.91
IV.BRIS.HHN. ML:1.7 0.0000809 0.72 AML other m 2021-10-25T17:12:44.49
IV.MGAB.HHN. ML:2.0 0.0001575 0.52 AML other m 2021-10-25T17:12:45.53
IV.MGAB.HHE. ML:2.0 0.000141 0.54 AML other m 2021-10-25T17:12:47.75
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