Earthquake with magnitude of ML 0.4 on date 22-08-2021 and time 08:45:21 (Italy) in region 2 km W Serra Sant'Abbondio (PU)

A magnitude ML 0.4 earthquake occured in region: 2 km W Serra Sant'Abbondio (PU), on

  • 22-08-2021 06:45:21 (UTC)
  • 22-08-2021 08:45:21 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.497, 12.753 at 13 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 2 1027 1027
Frontone PU 2 1300 2327
Pergola PU 10 6333 8660
Cagli PU 10 8731 17391
Cantiano PU 10 2245 19636
Sassoferrato AN 11 7285 26921
Scheggia e Pascelupo PG 12 1393 28314
Acqualagna PU 15 4393 32707
Arcevia AN 15 4612 37319
Costacciaro PG 16 1216 38535
Genga AN 17 1797 40332
Sigillo PG 18 2404 42736
Fratte Rosa PU 19 966 43702
San Lorenzo in Campo PU 20 3414 47116

Municipalities with at least 50000 inhabitants

An earthquake occurred to
44 Km SW of Fano (60888 inhabitants)
48 Km S of Pesaro (94582 inhabitants)
52 Km NE of Perugia (166134 inhabitants)
60 Km N of Foligno (57155 inhabitants)
63 Km W of Ancona (100861 inhabitants)
65 Km S of Rimini (147750 inhabitants)
70 Km E of Arezzo (99543 inhabitants)
82 Km SE of Cesena (96758 inhabitants)
99 Km SE of Forlì (117913 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
Felt maps
Preliminary map of the earthquake effects from the web questionnaire

Preliminary map of the earthquake effects from the web 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 0.4 2021-08-22
06:45:21
43.4972 12.7527 13 2021-08-22
06:51:37
Sala Sismica INGV-Roma 94485911
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-08-22 06:45:21 ± 0.08
Latitude 43.4972 ± 0.0036
Longitude 12.7527 ± 0.0050
Depth (km) 13 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 94485911

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 408
Semi-minor axis of confidence ellipse (meter) 75
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 275
Circular confidence region, given by single value of horizontal uncertainty (meter) 410
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 88
Number of associated phases, regardless of their use for origin computation 25
Number of defining phases 25
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) 0.02878
Epicentral distance of station farthest from the epicenter (degree) 0.41549
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:0.4

Field Value
Value 0.4
Uncertainty 0.2
Num. used stations 8
Type of magnitude ML
Reference to an origin 94485911
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-08-22 06:51:37
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.MURB.HHZ. 2021-08-22T06:45:32.01 0.3 undecidable manual S 215 0.2869 95 -0.22 68
IV.TB03.DHZ.01 2021-08-22T06:45:31.89 0.6 undecidable manual S 249 0.2662 96 0.27 46
IV.ATVO.HNZ. 2021-08-22T06:45:31.80 0.6 undecidable manual S 246 0.2761 96 -0.12 47
IV.MML1.EHZ. 2021-08-22T06:45:30.04 0.6 undecidable manual P 157 0.4155 93 0.26 45
IV.ATPC.HHZ. 2021-08-22T06:45:30.42 0.6 undecidable manual S 266 0.2149 99 0.3 46
IV.FOSV.EHZ. 2021-08-22T06:45:29.54 0.6 undecidable manual S 178 0.2023 100 -0.21 46
IV.NARO.HHZ. 2021-08-22T06:45:28.47 0.6 undecidable manual S 312 0.1691 105 -0.31 47
IV.PIEI.HHZ. 2021-08-22T06:45:28.40 0.6 undecidable manual S 284 0.1628 107 -0.2 48
IV.MPAG.EHZ. 2021-08-22T06:45:27.87 0.6 undecidable manual S 2 0.1322 115 0.11 48
IV.ATVO.HNZ. 2021-08-22T06:45:27.99 0.1 undecidable manual P 246 0.2761 96 0.58 85
IV.ARVD.HHZ. 2021-08-22T06:45:27.78 0.6 undecidable manual S 90 0.1367 113 -0.11 48
IV.TB03.DHZ.01 2021-08-22T06:45:27.04 0.1 undecidable manual P 249 0.2662 96 -0.2 92
IV.MURB.HHZ. 2021-08-22T06:45:27.72 0.6 negative manual P 215 0.2869 95 0.13 47
IV.ATPC.HHZ. 2021-08-22T06:45:26.17 0.1 undecidable manual P 266 0.2149 99 -0.2 93
IV.SSFR.HHZ. 2021-08-22T06:45:26.14 0.6 undecidable manual S 161 0.0648 143 -0.05 50
IV.ATSC.EHZ. 2021-08-22T06:45:26.79 0.6 undecidable manual S 213 0.0872 132 0.14 48
IV.FOSV.EHZ. 2021-08-22T06:45:26.11 0.6 positive manual P 178 0.2023 100 -0.05 48
IV.ARVD.HHZ. 2021-08-22T06:45:25.08 0.3 undecidable manual P 90 0.1367 113 0 74
IV.NARO.HHZ. 2021-08-22T06:45:25.38 0.6 positive manual P 312 0.1691 105 -0.22 47
IV.FRON.EHZ. 2021-08-22T06:45:25.83 0.6 undecidable manual S 317 0.0288 163 0.13 48
IV.PIEI.HHZ. 2021-08-22T06:45:25.54 0.1 undecidable manual P 284 0.1628 107 0.05 97
IV.SSFR.HHZ. 2021-08-22T06:45:24.10 0.1 undecidable manual P 161 0.0648 143 0 100
IV.MPAG.EHZ. 2021-08-22T06:45:24.64 1.0 negative manual P 2 0.1322 115 -0.37 23
IV.ATSC.EHZ. 2021-08-22T06:45:24.36 0.1 undecidable manual P 213 0.0872 132 -0.01 99
IV.FRON.EHZ. 2021-08-22T06:45:23.86 0.1 undecidable manual P 317 0.0288 163 0.04 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MPAG.EHE. ML:0.2 1.525E-5 0.1 AML other m 2021-08-22T06:45:27.86
IV.ARVD.HHE. ML:0.6 3.305E-5 0.22 AML other m 2021-08-22T06:45:28.19
IV.ARVD.HHN. ML:0.7 4.56E-5 1.68 AML other m 2021-08-22T06:45:28.12
IV.MPAG.EHN. ML:0.1 1.054E-5 1.2 AML other m 2021-08-22T06:45:28.86
IV.PIEI.HHN. ML:0.1 1.0815E-5 0.62 AML other m 2021-08-22T06:45:28.43
IV.PIEI.HHE. ML:0.5 2.33E-5 0.08 AML other m 2021-08-22T06:45:28.54
IV.NARO.HHE. ML:0.4 2.195E-5 0.14 AML other m 2021-08-22T06:45:28.68
IV.NARO.HHN. ML:0.4 1.99E-5 0.14 AML other m 2021-08-22T06:45:28.61
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