Earthquake with magnitude of ML 0.4 on date 31-08-2021 and time 08:30:39 (Italy) in region 3 km E Piobbico (PU)

A magnitude ML 0.4 earthquake occured in region: 3 km E Piobbico (PU), on

  • 31-08-2021 06:30:39 (UTC)
  • 31-08-2021 08:30:39 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.596, 12.55 at 6 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
Piobbico PU 3 2029 2029
Urbania PU 8 7099 9128
Cagli PU 10 8731 17859
Acqualagna PU 10 4393 22252
Apecchio PU 11 1882 24134
Peglio PU 12 696 24830
Fermignano PU 12 8596 33426
Sant'Angelo in Vado PU 13 4133 37559
Cantiano PU 15 2245 39804
Urbino PU 16 15019 54823
Lunano PU 17 1527 56350
Frontone PU 18 1300 57650
Piandimeleto PU 18 2167 59817
Mercatello sul Metauro PU 18 1378 61195
Pietralunga PG 19 2111 63306
Belforte all'Isauro PU 20 769 64075

Municipalities with at least 50000 inhabitants

An earthquake occurred to
46 Km SW of Pesaro (94582 inhabitants)
47 Km SW of Fano (60888 inhabitants)
52 Km S of Rimini (147750 inhabitants)
56 Km E of Arezzo (99543 inhabitants)
56 Km N of Perugia (166134 inhabitants)
65 Km SE of Cesena (96758 inhabitants)
72 Km N of Foligno (57155 inhabitants)
78 Km W of Ancona (100861 inhabitants)
81 Km SE of Forlì (117913 inhabitants)
94 Km SE of Faenza (58541 inhabitants)
96 Km SE of Ravenna (159116 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 2021-08-31
06:30:39
43.5957 12.5497 6 2021-08-31
06:34:30
Sala Sismica INGV-Roma 94854571
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-08-31 06:30:39 ± 0.28
Latitude 43.5957 ± 0.0072
Longitude 12.5497 ± 0.0075
Depth (km) 6 ± 3 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 94854571

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 798
Semi-minor axis of confidence ellipse (meter) 366
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 177
Circular confidence region, given by single value of horizontal uncertainty (meter) 800
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 133
Number of associated phases, regardless of their use for origin computation 10
Number of defining phases 10
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.31
Epicentral distance of station closest to the epicenter (degree) 0.02698
Epicentral distance of station farthest from the epicenter (degree) 0.23742
Number of stations at which the event was observed 6
Number of stations from which data was used for origin computation 6
Magnitude information

ML:0.4

Field Value
Value 0.4
Uncertainty 0.1
Num. used stations 4
Type of magnitude ML
Reference to an origin 94854571
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-08-31 06:34:30
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.PARC.HHZ. 2021-08-31T06:30:49.23 0.1 undecidable manual S 283 0.2311 103 0.26 95
IV.ATVO.HHZ. 2021-08-31T06:30:49.51 0.1 undecidable manual S 206 0.2374 103 0.31 93
IV.FRON.EHZ. 2021-08-31T06:30:46.05 0.1 undecidable manual S 121 0.1493 109 0.11 99
IV.MPAG.EHZ. 2021-08-31T06:30:46.61 0.1 undecidable manual S 77 0.1556 109 0.44 92
IV.ATVO.HHZ. 2021-08-31T06:30:45.01 0.1 undecidable manual P 206 0.2374 103 -0.23 95
IV.PARC.HHZ. 2021-08-31T06:30:45.02 0.1 undecidable manual P 283 0.2311 103 -0.09 98
IV.ATFO.HHZ. 2021-08-31T06:30:44.82 0.6 positive manual P 176 0.2293 103 -0.25 47
IV.FRON.EHZ. 2021-08-31T06:30:43.15 0.1 undecidable manual P 121 0.1493 109 -0.21 97
IV.MPAG.EHZ. 2021-08-31T06:30:43.43 0.1 undecidable manual P 77 0.1556 109 -0.06 100
IV.NARO.HHZ. 2021-08-31T06:30:40.80 0.1 undecidable manual P 56 0.027 153 -0.36 96
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.FRON.EHN. ML:0.6 4.075E-5 0.82 AML other m 2021-08-31T06:30:47.98
IV.MPAG.EHN. ML:0.3 2.155E-5 0.48 AML other m 2021-08-31T06:30:48.11
IV.MPAG.EHE. ML:0.3 1.895E-5 1.34 AML other m 2021-08-31T06:30:48.25
IV.FRON.EHE. ML:0.5 2.765E-5 0.7 AML other m 2021-08-31T06:30:49.03
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