Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.1 on date 23-10-2021 and time 15:36:20 (UTC) in region 1 km NE Serra Sant'Abbondio (PU)

A magnitude ML 1.1 earthquake occured in region: 1 km NE Serra Sant'Abbondio (PU), on

  • 23-10-2021 15:36:20 (UTC)
  • 23-10-2021 17:36:20 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.5020, 12.7780 at 16 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
Serra Sant'Abbondio PU 1 1027 1027
Frontone PU 3 1300 2327
Pergola PU 8 6333 8660
Sassoferrato AN 10 7285 15945
Cagli PU 12 8731 24676
Cantiano PU 12 2245 26921
Arcevia AN 13 4612 31533
Scheggia e Pascelupo PG 14 1393 32926
Genga AN 15 1797 34723
Acqualagna PU 16 4393 39116
Costacciaro PG 17 1216 40332
Fratte Rosa PU 18 966 41298
San Lorenzo in Campo PU 18 3414 44712
Sigillo PG 19 2404 47116

Municipalities with at least 50000 inhabitants

An earthquake occurred to
43 Km SW of Fano (60888 inhabitants)
47 Km S of Pesaro (94582 inhabitants)
54 Km NE of Perugia (166134 inhabitants)
61 Km N of Foligno (57155 inhabitants)
61 Km W of Ancona (100861 inhabitants)
65 Km S of Rimini (147750 inhabitants)
72 Km E of Arezzo (99543 inhabitants)
83 Km SE of Cesena (96758 inhabitants)
100 Km SE of Forlì (117913 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 1.1 2021-10-23
15:36:20		 43.5017 12.7778 16 2021-10-23
15:46:31		 Sala Sismica INGV-Roma 96912541
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-23 15:36:20 ± 0.09
Latitude 43.5017 ± 0.0036
Longitude 12.7778 ± 0.0050
Depth (km) 16 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 96912541

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 481
Semi-minor axis of confidence ellipse (meter) 151
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 219
Circular confidence region, given by single value of horizontal uncertainty (meter) 480.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 98
Number of associated phases, regardless of their use for origin computation 30
Number of defining phases 28
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.21
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.51621
Number of stations at which the event was observed 17
Number of stations from which data was used for origin computation 15
Magnitude information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.3
Num. used stations 17
Type of magnitude ML
Reference to an origin 96912541
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-23 15:46:31
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CAFI.HHZ. 2021-10-23T15:36:40.89 3.0 undecidable manual S -0.34 0
IV.BRSN.EHZ. 2021-10-23T15:36:36.54 3.0 negative manual P -0.17 0
IV.EL6.EHZ. 2021-10-23T15:36:31.96 0.3 undecidable manual S 126 32.3454 104 0.65 61
IV.SNTG.HHZ. 2021-10-23T15:36:30.81 0.3 undecidable manual S 154 30.3474 105 0.01 72
IV.FDMO.HHZ. 2021-10-23T15:36:30.27 0.3 undecidable manual P 154 57.2982 96 -0.09 67
IV.ATPC.HNZ. 2021-10-23T15:36:30.11 0.3 undecidable manual S 265 25.9518 109 0.44 66
IV.NARO.HHZ. 2021-10-23T15:36:28.10 0.3 undecidable manual S 307 19.9689 117 -0.1 73
IV.ATBU.EHZ. 2021-10-23T15:36:28.41 0.3 undecidable manual S 261 18.6702 119 0.5 66
IV.FOSV.EHZ. 2021-10-23T15:36:28.78 0.3 undecidable manual S 183 22.9548 113 -0.15 70
IV.ATFO.HHZ. 2021-10-23T15:36:28.86 0.3 undecidable manual S 228 22.3554 113 0.07 73
IV.PIEI.HHZ. 2021-10-23T15:36:27.98 0.3 undecidable manual S 281 19.869 117 -0.21 70
IV.MPAG.EHZ. 2021-10-23T15:36:27.04 0.3 undecidable manual S 354 14.2746 129 0.12 71
IV.SNTG.HHZ. 2021-10-23T15:36:26.12 0.1 undecidable manual P 154 30.3474 105 -0.14 93
IV.ARVD.HHZ. 2021-10-23T15:36:26.73 0.3 undecidable manual S 92 13.1757 132 0.03 73
IV.CING.HNZ. 2021-10-23T15:36:26.88 0.6 undecidable manual P 112 36.4413 102 -0.29 45
IV.EL6.EHZ. 2021-10-23T15:36:26.63 0.1 undecidable manual P 126 32.3454 104 0.07 94
IV.ATSC.EHZ. 2021-10-23T15:36:26.22 0.3 undecidable manual S 221 11.3775 137 -0.14 72
IV.FRON.EHZ. 2021-10-23T15:36:25.35 0.3 undecidable manual S 293 4.5954 161 -0.07 74
IV.ATFO.HHZ. 2021-10-23T15:36:25.26 0.1 undecidable manual P 228 22.3554 113 0.17 94
IV.SSFR.HHZ. 2021-10-23T15:36:25.60 0.3 undecidable manual S 177 7.2927 151 -0.11 73
IV.ATPC.HNZ. 2021-10-23T15:36:25.14 0.3 undecidable manual P 265 25.9518 109 -0.47 66
IV.FOSV.EHZ. 2021-10-23T15:36:25.00 0.1 undecidable manual P 183 22.9548 113 -0.18 93
IV.MPAG.EHZ. 2021-10-23T15:36:24.10 0.1 undecidable manual P 354 14.2746 129 0.08 96
IV.PIEI.HHZ. 2021-10-23T15:36:24.59 0.1 undecidable manual P 281 19.869 117 -0.16 95
IV.NARO.HHZ. 2021-10-23T15:36:24.66 0.1 undecidable manual P 307 19.9689 117 -0.1 97
IV.ATBU.EHZ. 2021-10-23T15:36:24.97 0.3 undecidable manual P 261 18.6702 119 0.38 68
IV.ATSC.EHZ. 2021-10-23T15:36:23.62 0.1 undecidable manual P 221 11.3775 137 -0.07 98
IV.FRON.EHZ. 2021-10-23T15:36:23.16 0.1 undecidable manual P 293 4.5954 161 0.01 100
IV.SSFR.HHZ. 2021-10-23T15:36:23.27 0.1 undecidable manual P 177 7.2927 151 -0.05 99
IV.ARVD.HHZ. 2021-10-23T15:36:23.80 0.1 undecidable manual P 92 13.1757 132 -0.09 98
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.FRON.EHE. ML:0.6 0.00004676289 0.064 AML other m 2021-10-23T15:36:25.41
IV.FRON.EHN. ML:1.0 0.0001025 0.38 AML other m 2021-10-23T15:36:25.49
IV.SSFR.HNN. ML:1.8 0.0006115 0.3 AML other m 2021-10-23T15:36:25.63
IV.SSFR.HHE. ML:1.6 0.0003535 0.08 AML other m 2021-10-23T15:36:25.63
IV.SSFR.HHN. ML:1.6 0.0004095 0.26 AML other m 2021-10-23T15:36:25.91
IV.SSFR.HNE. ML:1.7 0.0004595 1.4 AML other m 2021-10-23T15:36:26.91
IV.ARVD.HHN. ML:1.4 0.0001965 0.1 AML other m 2021-10-23T15:36:26.99
IV.ARVD.HHE. ML:1.2 0.000133 0.16 AML other m 2021-10-23T15:36:27.06
IV.MPAG.EHE. ML:1.2 0.00012475 0.38 AML other m 2021-10-23T15:36:27.16
IV.MPAG.EHN. ML:1.0 0.00007595 0.16 AML other m 2021-10-23T15:36:27.17
IV.PIEI.HHN. ML:0.8 0.0000391 0.08 AML other m 2021-10-23T15:36:28.20
IV.PIEI.HHE. ML:1.0 0.00006470000000000001 0.08 AML other m 2021-10-23T15:36:28.20
IV.NARO.HHN. ML:0.9 0.00004845 0.04 AML other m 2021-10-23T15:36:28.29
IV.NARO.HHE. ML:1.0 0.0000651 0.18 AML other m 2021-10-23T15:36:28.52
IV.MPAG.HNE. ML:1.2 0.0001243919 0.0768 AML other m 2021-10-23T15:36:27.19
IV.FOSV.EHE. ML:0.4 0.000015269355 0.1536 AML other m 2021-10-23T15:36:29.77
IV.FOSV.EHN. ML:0.7 0.000029449265 0.1408 AML other m 2021-10-23T15:36:28.92
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