Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.9 on date 31-10-2021 and time 17:01:31 (Italy) in region 5 km SW Apecchio (PU)

A magnitude ML 0.9 earthquake occured in region: 5 km SW Apecchio (PU), on

  • 31-10-2021 16:01:31 (UTC)
  • 31-10-2021 17:01:31 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.5130, 12.4000 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
Apecchio PU 5 1882 1882
Pietralunga PG 8 2111 3993
Piobbico PU 12 2029 6022
Città di Castello PG 14 39913 45935
Mercatello sul Metauro PU 16 1378 47313
Sant'Angelo in Vado PU 17 4133 51446
Montone PG 18 1680 53126
Borgo Pace PU 18 606 53732
San Giustino PG 18 11297 65029
Cantiano PU 19 2245 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)
67 Km NW of Foligno (57155 inhabitants)
71 Km S of Cesena (96758 inhabitants)
84 Km SE of Forlì (117913 inhabitants)
89 Km E of Siena (53903 inhabitants)
91 Km W of Ancona (100861 inhabitants)
95 Km SE of Faenza (58541 inhabitants)
96 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 0.9 2021-10-31
16:01:31		 43.5127 12.3997 9 2021-10-31
16:19:10		 Sala Sismica INGV-Roma 97114901
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-31 16:01:31 ± 0.05
Latitude 43.5127 ± 0.0027
Longitude 12.3997 ± 0.0025
Depth (km) 9 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 97114901

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 199
Semi-minor axis of confidence ellipse (meter) 199
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 141
Circular confidence region, given by single value of horizontal uncertainty (meter) 230.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 59
Number of associated phases, regardless of their use for origin computation 26
Number of defining phases 26
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.15
Epicentral distance of station closest to the epicenter (degree) 0.04766
Epicentral distance of station farthest from the epicenter (degree) 0.36423
Number of stations at which the event was observed 13
Number of stations from which data was used for origin computation 13
Magnitude information

ML:0.9

Field Value
Value 0.9
Uncertainty 0.3
Num. used stations 14
Type of magnitude ML
Reference to an origin 97114901
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-31 16:19:10
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CAFI.HHZ. 2021-10-31T16:01:45.15 0.6 undecidable manual S 240 40.4262 50 0.33 44
IV.MPAG.EHZ. 2021-10-31T16:01:42.37 0.6 undecidable manual S 66 31.6461 50 -0.12 47
IV.PARC.HHZ. 2021-10-31T16:01:39.01 0.6 undecidable manual S 319 19.869 115 0.2 47
IV.ATMI.HHZ. 2021-10-31T16:01:39.66 0.6 undecidable manual S 208 22.4553 113 0.03 48
IV.CAFI.HHZ. 2021-10-31T16:01:38.88 0.3 undecidable manual P 240 40.4262 50 -0.18 68
IV.NARO.HHZ. 2021-10-31T16:01:38.08 0.6 undecidable manual S 53 18.1707 117 -0.21 47
IV.ATBU.HNZ. 2021-10-31T16:01:37.08 0.6 undecidable manual S 109 12.6762 127 0.43 45
IV.ATVO.HHZ. 2021-10-31T16:01:37.15 0.6 undecidable manual S 178 14.4744 123 -0.03 49
IV.MPAG.EHZ. 2021-10-31T16:01:37.49 0.3 undecidable manual P 66 31.6461 50 -0.22 68
IV.PIEI.HHZ. 2021-10-31T16:01:36.60 0.6 undecidable manual S 77 11.1777 130 0.35 46
IV.ATMI.HHZ. 2021-10-31T16:01:36.07 0.3 undecidable manual P 208 22.4553 113 0 73
IV.BADI.EHZ. 2021-10-31T16:01:36.48 0.3 undecidable manual S 269 12.4764 127 -0.13 72
IV.TB03.DHZ. 2021-10-31T16:01:36.40 0.6 undecidable manual S 176 12.3765 127 -0.18 48
IV.NARO.HHZ. 2021-10-31T16:01:35.14 0.1 undecidable manual P 53 18.1707 117 -0.15 95
IV.PARC.HHZ. 2021-10-31T16:01:35.70 0.3 undecidable manual P 319 19.869 115 0.11 72
IV.ATVO.HHZ. 2021-10-31T16:01:34.69 0.1 positive manual P 178 14.4744 123 0.04 98
IV.TB03.DHZ. 2021-10-31T16:01:34.29 0.1 undecidable manual P 176 12.3765 127 -0.01 99
IV.ATPC.HNZ. 2021-10-31T16:01:34.80 0.6 undecidable manual S 127 5.7942 148 -0.22 48
IV.PIEI.HHZ. 2021-10-31T16:01:34.15 0.1 undecidable manual P 77 11.1777 130 0.04 98
IV.APEC.HHZ. 2021-10-31T16:01:34.76 0.6 undecidable manual S 18 5.2947 150 -0.17 48
IV.BADI.EHZ. 2021-10-31T16:01:34.39 0.1 positive manual P 269 12.4764 127 0.07 97
IV.ATBU.HNZ. 2021-10-31T16:01:34.56 0.1 undecidable manual P 109 12.6762 127 0.22 95
IV.ATPI.EHZ. 2021-10-31T16:01:34.93 0.6 undecidable manual S 178 6.8931 144 -0.29 47
IV.APEC.HHZ. 2021-10-31T16:01:33.35 0.1 undecidable manual P 18 5.2947 150 0 100
IV.ATPI.EHZ. 2021-10-31T16:01:33.50 0.1 positive manual P 178 6.8931 144 -0.02 99
IV.ATPC.HNZ. 2021-10-31T16:01:33.44 0.1 undecidable manual P 127 5.7942 148 0.04 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.ATPI.EHE. ML:1.0 0.0001505 0.44 AML other m 2021-10-31T16:01:35.00
IV.APEC.HHE. ML:1.5 0.000527 1.66 AML other m 2021-10-31T16:01:35.90
IV.ATPI.EHN. ML:1.1 0.00020250000000000002 0.16 AML other m 2021-10-31T16:01:35.07
IV.APEC.HHN. ML:1.3 0.00032250000000000003 0.3 AML other m 2021-10-31T16:01:35.09
IV.BADI.EHN. ML:1.2 0.0001995 0.3 AML other m 2021-10-31T16:01:36.75
IV.PIEI.HHN. ML:0.7 0.000060049999999999996 1.18 AML other m 2021-10-31T16:01:36.25
IV.BADI.EHE. ML:1.1 0.000133 0.86 AML other m 2021-10-31T16:01:37.31
IV.PIEI.HHE. ML:0.9 0.0000949 0.76 AML other m 2021-10-31T16:01:37.43
IV.ATVO.HHN. ML:1.1 0.00011315 0.2 AML other m 2021-10-31T16:01:37.64
IV.ATVO.HHE. ML:1.0 0.00011125000000000002 0.68 AML other m 2021-10-31T16:01:37.77
IV.NARO.HHN. ML:0.6 0.000035699999999999994 0.76 AML other m 2021-10-31T16:01:38.61
IV.NARO.HHE. ML:0.6 0.00003505 0.06 AML other m 2021-10-31T16:01:39.21
IV.PARC.HHN. ML:0.6 0.000030350000000000002 0.82 AML other m 2021-10-31T16:01:39.79
IV.PARC.HHE. ML:0.7 0.000034 1.28 AML other m 2021-10-31T16:01:40.96
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