Earthquake with magnitude of ML 1.1 on date 23-10-2020 and time 04:55:32 (UTC) in region 4 km SW Serra Sant'Abbondio (PU)

A magnitude ML 1.1 earthquake occured in region: 4 km SW Serra Sant'Abbondio (PU), on

  • 23-10-2020 04:55:32 (UTC)
  • 23-10-2020 06:55:32 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.47, 12.73 at 42 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.

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 4 1027 1027
Frontone PU 5 1300 2327
Cantiano PU 8 2245 4572
Scheggia e Pascelupo PG 9 1393 5965
Cagli PU 11 8731 14696
Sassoferrato AN 11 7285 21981
Costacciaro PG 12 1216 23197
Pergola PU 14 6333 29530
Sigillo PG 15 2404 31934
Genga AN 17 1797 33731
Acqualagna PU 17 4393 38124
Arcevia AN 17 4612 42736
Gubbio PG 18 32216 74952
Fossato di Vico PG 20 2840 77792

Municipalities with at least 50000 inhabitants

An earthquake occurred to
48 Km SW of Fano (60888 inhabitants)
49 Km NE of Perugia (166134 inhabitants)
51 Km SW of Pesaro (94582 inhabitants)
57 Km N of Foligno (57155 inhabitants)
66 Km W of Ancona (100861 inhabitants)
67 Km S of Rimini (147750 inhabitants)
68 Km E of Arezzo (99543 inhabitants)
84 Km SE of Cesena (96758 inhabitants)
Recent and historical Seismicity
Seismic hazard
Shakemap
Felt maps
The earthquake effects in MCS scale as obtained from the compiled questionnaire

The earthquake effects in MCS scale as obtained from the compiled questionnaire

This map shows the distribution of the effects of the earthquake on the territory in terms of the MCS (Mercalli-Cancani-Sieberg) intensity scale. The intensities are determined using the data provided in the questionnaire (http://www.haisentitoilterremoto.it/) that are analysed using robust statistical techniques since they are not verified individually. Specifically, the assignment of MCS intensities greater or equal the VI degree of the MCS scale require opportune in situ verification by professional experts. The purple start shows the epicenter. This map is prepared every so often that the population fill in new questionnaires. The number of questionnaires used to determine the map and the date and time of the last adjournment are shown in the upper right part of the panel.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100
ML 1.1 2020-10-23
04:55:32
43.47 12.73 42 2020-10-23
05:04:03
Sala Sismica INGV-Roma 84048921
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-10-23 04:55:32 ± 0.24
Latitude 43.47 ± 0.01
Longitude 12.73 ± 0.02
Depth (km) 42 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 84048921

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1479
Semi-minor axis of confidence ellipse (meter) 1017
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 191
Circular confidence region, given by single value of horizontal uncertainty (meter) 1480
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 84
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) 0.2
Epicentral distance of station closest to the epicenter (degree) 0.04856
Epicentral distance of station farthest from the epicenter (degree) 0.19965
Number of stations at which the event was observed 8
Number of stations from which data was used for origin computation 8
Magnitude information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.4
Num. used stations 10
Type of magnitude ML
Reference to an origin 84048921
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-10-23 05:04:03
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.ATBU.EHZ. 2020-10-23T04:55:45.34 0.3 undecidable manual S 273 0.1331 155 0.22 71
IV.NARO.HHZ. 2020-10-23T04:55:45.42 0.6 undecidable manual S 322 0.1781 147 -0.23 47
IV.MPAG.EHZ. 2020-10-23T04:55:45.44 0.6 undecidable manual S 7 0.161 150 0.01 49
IV.ARVD.HHZ. 2020-10-23T04:55:45.49 0.6 undecidable manual S 79 0.1547 151 0.13 48
IV.SSFR.HHZ. 2020-10-23T04:55:44.52 0.3 undecidable manual S 132 0.0495 170 0 76
IV.FRON.EHZ. 2020-10-23T04:55:44.22 0.6 undecidable manual S 355 0.0486 171 -0.29 48
IV.ATSC.EHZ. 2020-10-23T04:55:44.55 0.3 undecidable manual S 216 0.0558 169 0 75
IV.MPAG.EHZ. 2020-10-23T04:55:40.14 0.6 negative manual P 7 0.161 150 0.16 48
IV.ARVD.HHZ. 2020-10-23T04:55:40.44 0.6 positive manual P 79 0.1547 151 0.5 45
IV.ATPC.HNZ. 2020-10-23T04:55:40.45 0.1 undecidable manual P 273 0.1996 143 0.17 95
IV.SSFR.HHZ. 2020-10-23T04:55:39.03 0.1 undecidable manual P 132 0.0495 170 -0.43 92
IV.FRON.EHZ. 2020-10-23T04:55:39.44 0.3 positive manual P 355 0.0486 171 -0.01 75
IV.ATBU.EHZ. 2020-10-23T04:55:39.91 0.1 undecidable manual P 273 0.1331 155 0.11 97
IV.ATSC.EHZ. 2020-10-23T04:55:39.45 0.1 undecidable manual P 216 0.0558 169 -0.03 100
IV.NARO.HHZ. 2020-10-23T04:55:39.99 0.1 undecidable manual P 322 0.1781 147 -0.12 96
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.APEC.HHE. ML:2 0.000305 0.08 AML other m 2020-10-23T04:55:40.77
IV.FRON.EHE. ML:0.8 1.872809E-5 0.0992 AML other m 2020-10-23T04:55:44.54
IV.FRON.EHN. ML:1 3.420243E-5 0.1792 AML other m 2020-10-23T04:55:45.12
IV.NARO.HHE. ML:1.3 5.695298E-5 0.1184 AML other m 2020-10-23T04:55:45.52
IV.NARO.HHN. ML:1.2 4.2894165E-5 0.1216 AML other m 2020-10-23T04:55:45.53
IV.MPAG.HNN. ML:1.6 0.0001298879 0.5696 AML other m 2020-10-23T04:55:46.03
IV.MPAG.EHE. ML:1.3 5.4178565E-5 0.1216 AML other m 2020-10-23T04:55:45.73
IV.MPAG.EHN. ML:1.1 3.609026E-5 0.1216 AML other m 2020-10-23T04:55:46.08
IV.ARVD.HHE. ML:0.7 1.54848395E-5 0.0992 AML other m 2020-10-23T04:55:45.98
IV.ARVD.HHN. ML:0.5 1.2061963E-5 0.1184 AML other m 2020-10-23T04:55:46.60
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download