Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.0 on date 31-10-2021 and time 14:55:09 (Italy) in region 6 km S Apecchio (PU)

A magnitude ML 1.0 earthquake occured in region: 6 km S Apecchio (PU), on

  • 31-10-2021 13:55:09 (UTC)
  • 31-10-2021 14:55:09 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.5080, 12.4040 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.

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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
Apecchio PU 6 1882 1882
Pietralunga PG 8 2111 3993
Piobbico PU 13 2029 6022
Città di Castello PG 14 39913 45935
Mercatello sul Metauro PU 17 1378 47313
Montone PG 17 1680 48993
Sant'Angelo in Vado PU 18 4133 53126
Cantiano PU 19 2245 55371
San Giustino PG 19 11297 66668
Borgo Pace PU 19 606 67274

Municipalities with at least 50000 inhabitants

An earthquake occurred to
42 Km E of Arezzo (99543 inhabitants)
45 Km N of Perugia (166134 inhabitants)
61 Km SW of Pesaro (94582 inhabitants)
62 Km SW of Fano (60888 inhabitants)
63 Km S of Rimini (147750 inhabitants)
66 Km NW of Foligno (57155 inhabitants)
71 Km S of Cesena (96758 inhabitants)
85 Km SE of Forlì (117913 inhabitants)
89 Km E of Siena (53903 inhabitants)
91 Km W of Ancona (100861 inhabitants)
96 Km SE of Faenza (58541 inhabitants)
97 Km E of Firenze (382808 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 1.0 2021-10-31
13:55:09		 43.5082 12.4035 10 2021-10-31
13:59:40		 Sala Sismica INGV-Roma 97112001
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-31 13:55:09 ± 0.08
Latitude 43.5082 ± 0.0027
Longitude 12.4035 ± 0.0050
Depth (km) 10 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 97112001

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 327
Semi-minor axis of confidence ellipse (meter) 215
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 110
Circular confidence region, given by single value of horizontal uncertainty (meter) 330.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 90
Number of associated phases, regardless of their use for origin computation 24
Number of defining phases 24
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.18
Epicentral distance of station closest to the epicenter (degree) 0.04766
Epicentral distance of station farthest from the epicenter (degree) 0.28509
Number of stations at which the event was observed 12
Number of stations from which data was used for origin computation 12
Magnitude information

ML:1.0

Field Value
Value 1.0
Uncertainty 0.2
Num. used stations 14
Type of magnitude ML
Reference to an origin 97112001
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-31 13:59:40
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MPAG.EHZ. 2021-10-31T13:55:21.11 0.6 undecidable manual S 65 31.6461 50 -0.05 48
IV.PE3.EHZ. 2021-10-31T13:55:18.77 0.6 undecidable manual S 20 22.1556 113 0.48 44
IV.PARC.HHZ. 2021-10-31T13:55:17.94 0.6 undecidable manual S 320 20.4684 115 0.18 47
IV.ATFO.HHZ. 2021-10-31T13:55:17.88 0.6 undecidable manual S 139 20.7681 115 0.04 49
IV.MPAG.EHZ. 2021-10-31T13:55:16.23 0.1 undecidable manual P 65 31.6461 50 -0.18 93
IV.NARO.HHZ. 2021-10-31T13:55:16.40 0.6 undecidable manual S 51 18.2706 118 -0.67 41
IV.PIEI.HHZ. 2021-10-31T13:55:15.37 0.6 undecidable manual S 74 10.9779 131 0.39 46
IV.BADI.EHZ. 2021-10-31T13:55:15.25 0.3 undecidable manual S 271 12.7761 127 -0.22 71
IV.ATVO.HHZ. 2021-10-31T13:55:15.93 0.6 undecidable manual S 179 13.9749 124 0.13 48
IV.TB03.DHZ. 2021-10-31T13:55:15.16 0.6 undecidable manual S 177 11.877 129 -0.04 49
IV.PE3.EHZ. 2021-10-31T13:55:15.15 0.3 undecidable manual P 20 22.1556 113 0.39 67
IV.PARC.HHZ. 2021-10-31T13:55:14.42 0.1 undecidable manual P 320 20.4684 115 -0.03 97
IV.ATFO.HHZ. 2021-10-31T13:55:14.47 0.3 undecidable manual P 139 20.7681 115 -0.03 73
IV.ATPC.HNZ. 2021-10-31T13:55:13.64 0.6 undecidable manual S 125 5.2947 151 -0.06 50
IV.NARO.HHZ. 2021-10-31T13:55:13.91 0.1 undecidable manual P 51 18.2706 118 -0.14 96
IV.APEC.HNE. 2021-10-31T13:55:13.46 0.6 undecidable manual S 13 5.7942 149 -0.32 47
IV.BADI.EHZ. 2021-10-31T13:55:13.14 0.1 positive manual P 271 12.7761 127 0.02 99
IV.ATPI.EHZ. 2021-10-31T13:55:13.67 0.6 undecidable manual S 181 6.3936 146 -0.23 48
IV.ATVO.HHZ. 2021-10-31T13:55:13.44 0.1 undecidable manual P 179 13.9749 124 0.13 97
IV.TB03.DHZ. 2021-10-31T13:55:13.05 0.1 undecidable manual P 177 11.877 129 0.08 98
IV.ATPI.EHZ. 2021-10-31T13:55:12.24 0.1 undecidable manual P 181 6.3936 146 0.02 100
IV.PIEI.HHZ. 2021-10-31T13:55:12.90 0.1 undecidable manual P 74 10.9779 131 0.06 98
IV.ATPC.HNZ. 2021-10-31T13:55:12.18 0.1 undecidable manual P 125 5.2947 151 0.07 99
IV.APEC.HNE. 2021-10-31T13:55:12.10 0.1 undecidable manual P 13 5.7942 149 -0.05 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.ATPI.EHE. ML:1.0 0.00014649999999999998 0.3 AML other m 2021-10-31T13:55:13.77
IV.ATPI.EHN. ML:1.1 0.0001895 0.3 AML other m 2021-10-31T13:55:13.83
IV.BADI.EHN. ML:1.2 0.0001595 0.32 AML other m 2021-10-31T13:55:15.49
IV.PIEI.HHN. ML:0.7 0.00006720000000000001 0.8 AML other m 2021-10-31T13:55:15.99
IV.BADI.EHE. ML:1.3 0.0001995 0.9 AML other m 2021-10-31T13:55:16.03
IV.PIEI.HHE. ML:1.0 0.00012090000000000001 0.1 AML other m 2021-10-31T13:55:16.05
IV.ATVO.HHN. ML:1.0 0.00011180000000000001 0.18 AML other m 2021-10-31T13:55:16.40
IV.ATVO.HHE. ML:1.0 0.00011064999999999999 0.68 AML other m 2021-10-31T13:55:16.53
IV.NARO.HHE. ML:0.7 0.00004285 1.52 AML other m 2021-10-31T13:55:18.95
IV.NARO.HHN. ML:0.6 0.000036400000000000004 0.98 AML other m 2021-10-31T13:55:18.97
IV.PARC.HHE. ML:0.6 0.00003165 1.32 AML other m 2021-10-31T13:55:18.73
IV.PARC.HHN. ML:0.6 0.0000291 0.16 AML other m 2021-10-31T13:55:19.37
IV.CRTC.HHN. ML:1.3 0.0000508 0.54 AML other m 2021-10-31T13:55:26.45
IV.CRTC.HHE. ML:1.3 0.00004965 0.42 AML other m 2021-10-31T13:55:27.61
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