Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.9 on date 28-10-2021 and time 00:24:49 (UTC) in region 1 km E Pieve Santo Stefano (AR)

A magnitude ML 0.9 earthquake occured in region: 1 km E Pieve Santo Stefano (AR), on

  • 28-10-2021 00:24:49 (UTC)
  • 28-10-2021 02:24:49 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.6710, 12.0530 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.

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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 1 3183 3183
Caprese Michelangelo AR 6 1426 4609
Chiusi della Verna AR 10 2023 6632
Badia Tedalda AR 12 1087 7719
Sansepolcro AR 13 15884 23603
Chitignano AR 14 899 24502
Anghiari AR 14 5638 30140
Verghereto FC 15 1907 32047
Casteldelci RN 16 407 32454
San Giustino PG 17 11297 43751
Castel Focognano AR 18 3149 46900
Subbiano AR 18 6331 53231
Bibbiena AR 19 12241 65472
Capolona AR 20 5438 70910
Borgo Pace PU 20 606 71516
Citerna PG 20 3531 75047

Municipalities with at least 50000 inhabitants

An earthquake occurred to
26 Km NE of Arezzo (99543 inhabitants)
54 Km S of Cesena (96758 inhabitants)
60 Km SW of Rimini (147750 inhabitants)
62 Km S of Forlì (117913 inhabitants)
65 Km E of Firenze (382808 inhabitants)
68 Km NW of Perugia (166134 inhabitants)
70 Km S of Faenza (58541 inhabitants)
70 Km NE of Siena (53903 inhabitants)
71 Km E of Scandicci (50609 inhabitants)
74 Km W of Pesaro (94582 inhabitants)
80 Km W of Fano (60888 inhabitants)
80 Km E of Prato (191150 inhabitants)
81 Km SE of Imola (69797 inhabitants)
84 Km S of Ravenna (159116 inhabitants)
95 Km NW of Foligno (57155 inhabitants)
96 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
Reviewed
Rev100 		ML 0.9 2021-10-28
00:24:49		 43.6708 12.053 9 2021-10-28
00:49:50		 Sala Sismica INGV-Roma 97030571
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-28 00:24:49 ± 0.09
Latitude 43.6708 ± 0.0054
Longitude 12.0530 ± 0.0050
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 97030571

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 472
Semi-minor axis of confidence ellipse (meter) 407
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 202
Circular confidence region, given by single value of horizontal uncertainty (meter) 470.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 117
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) 0.14
Epicentral distance of station closest to the epicenter (degree) 0.08993
Epicentral distance of station farthest from the epicenter (degree) 0.38671
Number of stations at which the event was observed 10
Number of stations from which data was used for origin computation 10
Magnitude information

ML:0.9

Field Value
Value 0.9
Uncertainty 0.2
Num. used stations 6
Type of magnitude ML
Reference to an origin 97030571
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-28 00:49:50
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.APEC.HHZ. 2021-10-28T00:25:00.85 0.6 undecidable manual S 113 32.0457 50 0.33 47
IV.BADI.EHZ. 2021-10-28T00:24:57.62 0.6 undecidable manual S 139 23.5542 111 -0.23 48
IV.NARO.HHZ. 2021-10-28T00:24:57.10 1.0 undecidable manual P 99 42.9237 50 -0.26 23
IV.PE3.EHZ. 2021-10-28T00:24:56.67 1.0 undecidable manual P 85 35.6421 50 0.42 23
IV.SFI.EHZ. 2021-10-28T00:24:55.61 1.0 negative manual P 328 30.747 50 0.12 24
IV.PARC.HHZ. 2021-10-28T00:24:55.08 0.6 undecidable manual S 99 15.0738 121 -0.12 51
IV.APEC.HHZ. 2021-10-28T00:24:55.68 1.0 undecidable manual P 113 32.0457 50 -0.01 25
IV.SSP9.EHZ. 2021-10-28T00:24:54.47 0.6 undecidable manual S 150 12.4764 126 0.04 51
IV.ASQU.HHE. 2021-10-28T00:24:54.27 0.3 undecidable manual P 304 25.3524 110 -0.2 73
IV.BADI.EHZ. 2021-10-28T00:24:54.05 0.6 negative manual P 139 23.5542 111 -0.09 50
IV.ATMC.EHZ. 2021-10-28T00:24:54.77 0.1 undecidable manual P 156 27.2505 108 -0.07 98
IV.CRE.HHZ. 2021-10-28T00:24:53.74 0.6 undecidable manual S 235 9.9789 132 -0.02 52
IV.SSP9.EHZ. 2021-10-28T00:24:52.32 1.0 undecidable manual P 150 12.4764 126 0.15 25
IV.PARC.HHZ. 2021-10-28T00:24:52.70 0.6 positive manual P 99 15.0738 121 0.09 50
IV.CRE.HHZ. 2021-10-28T00:24:51.95 0.1 positive manual P 235 9.9789 132 0.17 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CRE.HHE. ML:0.8 0.00009265 1.78 AML other m 2021-10-28T00:24:54.90
IV.CRE.HHN. ML:0.9 0.0001008 0.68 AML other m 2021-10-28T00:24:54.37
IV.SSP9.EHN. ML:0.9 0.0000916 1.28 AML other m 2021-10-28T00:24:54.22
IV.PARC.HHN. ML:1.2 0.00016350000000000002 0.22 AML other m 2021-10-28T00:24:55.37
IV.SSP9.EHE. ML:0.8 0.0000639 0.7 AML other m 2021-10-28T00:24:55.73
IV.PARC.HHE. ML:0.7 0.000047600000000000005 0.16 AML other m 2021-10-28T00:24:55.54
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