Earthquake with magnitude of ML 1.1 on date 26-08-2020 and time 12:25:38 (Italy) in region 3 km NW Spoleto (PG)

A magnitude ML 1.1 earthquake occured in region: 3 km NW Spoleto (PG), on

  • 26-08-2020 10:25:38 (UTC)
  • 26-08-2020 12:25:38 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.76, 12.72 at 10 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
Spoleto PG 3 38218 38218
Castel Ritaldi PG 8 3278 41496
Campello sul Clitunno PG 9 2442 43938
Sant'Anatolia di Narco PG 10 564 44502
Scheggino PG 11 461 44963
Vallo di Nera PG 12 364 45327
Trevi PG 14 8469 53796
Giano dell'Umbria PG 14 3846 57642
Acquasparta TR 16 4778 62420
Massa Martana PG 16 3770 66190
Montefalco PG 16 5679 71869
Ferentillo TR 16 1913 73782
Cerreto di Spoleto PG 18 1075 74857
Montefranco TR 18 1276 76133
Poggiodomo PG 18 117 76250
Arrone TR 20 2763 79013

Municipalities with at least 50000 inhabitants

An earthquake occurred to
22 Km S of Foligno (57155 inhabitants)
23 Km N of Terni (111501 inhabitants)
47 Km SE of Perugia (166134 inhabitants)
63 Km NE of Viterbo (67173 inhabitants)
72 Km NW of L'Aquila (69753 inhabitants)
81 Km W of Teramo (54892 inhabitants)
84 Km N of Guidonia Montecelio (88673 inhabitants)
88 Km N of Tivoli (56533 inhabitants)
98 Km N of Roma (2864731 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 2020-08-26
10:25:38
42.76 12.72 10 2020-08-26
10:29:19
Sala Sismica INGV-Roma 82344971
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-08-26 10:25:38 ± 0.07
Latitude 42.76 ± 0.01
Longitude 12.72 ± 0.00
Depth (km) 10 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 82344971

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 609
Semi-minor axis of confidence ellipse (meter) 351
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 209
Circular confidence region, given by single value of horizontal uncertainty (meter) 610
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 96
Number of associated phases, regardless of their use for origin computation 12
Number of defining phases 12
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) 0.11871
Epicentral distance of station farthest from the epicenter (degree) 0.48833
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:1.1

Field Value
Value 1.1
Uncertainty 0.2
Num. used stations 12
Type of magnitude ML
Reference to an origin 82344971
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-08-26 10:29:19
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.CSP1.EHZ. 2020-08-26T10:25:55.63 0.1 undecidable manual S 47 0.4883 50 0.23 90
IV.NRCA.HHZ. 2020-08-26T10:25:49.64 0.1 undecidable manual S 75 0.3004 50 -0.18 94
IV.ASSB.HHZ. 2020-08-26T10:25:49.61 0.1 undecidable manual S 351 0.2887 50 0.13 96
IV.CSP1.EHZ. 2020-08-26T10:25:47.98 1.0 positive manual P 47 0.4883 50 -0.16 23
IV.CESX.HHZ. 2020-08-26T10:25:45.90 0.1 undecidable manual S 213 0.1772 117 0.03 100
IV.NRCA.HHZ. 2020-08-26T10:25:44.62 0.3 positive manual P 75 0.3004 50 -0.29 69
IV.GAVE.EHZ. 2020-08-26T10:25:44.91 0.1 undecidable manual S 117 0.1439 122 0.15 98
IV.ASSB.HHZ. 2020-08-26T10:25:44.80 1.0 positive manual P 351 0.2887 50 0.08 24
IV.CESX.HHZ. 2020-08-26T10:25:43.14 1.0 undecidable manual P 213 0.1772 117 0.5 23
IV.MOMA.HHZ. 2020-08-26T10:25:43.87 0.1 undecidable manual S 293 0.1187 127 -0.07 100
IV.GAVE.EHZ. 2020-08-26T10:25:41.84 0.6 undecidable manual P 117 0.1439 122 -0.16 49
IV.MOMA.HHZ. 2020-08-26T10:25:41.43 0.1 positive manual P 293 0.1187 127 -0.09 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MOMA.HNN. ML:1.3 0.0002265 0.56 AML other m 2020-08-26T10:25:44.39
IV.MOMA.HHN. ML:1.2 0.0001525 0.34 AML other m 2020-08-26T10:25:44.38
IV.MOMA.HHE. ML:1.5 0.000317 0.18 AML other m 2020-08-26T10:25:44.28
IV.MOMA.HNE. ML:1.4 0.0002935 0.18 AML other m 2020-08-26T10:25:44.29
IV.GAVE.EHE. ML:1.1 0.0001061 1.02 AML other m 2020-08-26T10:25:45.45
IV.GAVE.EHN. ML:1.1 0.00010555 0.16 AML other m 2020-08-26T10:25:45.93
IV.CESX.HHN. ML:1 7.11E-5 0.24 AML other m 2020-08-26T10:25:46.57
IV.CESX.HHE. ML:0.9 5.525E-5 0.96 AML other m 2020-08-26T10:25:46.44
IV.ASSB.HHN. ML:0.8 2.88E-5 0.16 AML other m 2020-08-26T10:25:49.64
IV.ASSB.HHE. ML:1 3.77E-5 0.22 AML other m 2020-08-26T10:25:49.62
IV.NRCA.HHN. ML:0.9 3.715E-5 0.38 AML other m 2020-08-26T10:25:49.74
IV.NRCA.HHE. ML:1 4.27E-5 0.16 AML other m 2020-08-26T10:25:49.83
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
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QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download