Earthquake with magnitude of ML 0.8 on date 26-07-2021 and time 11:43:57 (Italy) in region 4 km SW Norcia (PG)

A magnitude ML 0.8 earthquake occured in region: 4 km SW Norcia (PG), on

  • 26-07-2021 09:43:57 (UTC)
  • 26-07-2021 11:43:57 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.767, 13.063 at 11 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
Norcia PG 4 4957 4957
Cascia PG 7 3217 8174
Poggiodomo PG 12 117 8291
Preci PG 13 724 9015
Cerreto di Spoleto PG 13 1075 10090
Monteleone di Spoleto PG 16 599 10689
Castelsantangelo sul Nera MC 16 281 10970
Vallo di Nera PG 16 364 11334
Accumoli RI 17 667 12001
Sellano PG 18 1079 13080
Cittareale RI 18 482 13562
Visso MC 18 1107 14669
Sant'Anatolia di Narco PG 19 564 15233
Arquata del Tronto AP 19 1178 16411
Scheggino PG 20 461 16872

Municipalities with at least 50000 inhabitants

An earthquake occurred to
36 Km SE of Foligno (57155 inhabitants)
41 Km NE of Terni (111501 inhabitants)
54 Km NW of L'Aquila (69753 inhabitants)
54 Km W of Teramo (54892 inhabitants)
67 Km SE of Perugia (166134 inhabitants)
88 Km E of Viterbo (67173 inhabitants)
90 Km NE of Guidonia Montecelio (88673 inhabitants)
92 Km N of Tivoli (56533 inhabitants)
93 Km W of Montesilvano (53738 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 earthquake resentment in the area, expressed in terms of intensity on the MCS scale (Mercalli-Cancani-Sieberg). Intensities are determined using data from questionnaires collected on the website http://www.hsit.it. The intensities shown are determined considering all the reports received from each municipality, and are all the more reliable the greater the number of questionnaires. The collected data are subjected to an automatic statistical filter, but are not checked individually. In particular, intensities greater than or equal to the VI degree of the MCS or EMS scale require on-site verification by specialized personnel. The black star is the epicenter of the earthquake that occurred. This map is updated every time citizens fill out new questionnaires. The number of questionnaires processed to obtain this map, the date and time of the last update are shown at the top right.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100
ML 0.8 2021-07-26
09:43:57
42.7673 13.0633 11 2021-07-26
10:13:00
Sala Sismica INGV-Roma 93232331
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-07-26 09:43:57 ± 0.08
Latitude 42.7673 ± 0.0036
Longitude 13.0633 ± 0.0086
Depth (km) 11 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 93232331

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 744
Semi-minor axis of confidence ellipse (meter) 267
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 105
Circular confidence region, given by single value of horizontal uncertainty (meter) 740
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 124
Number of associated phases, regardless of their use for origin computation 13
Number of defining phases 13
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) 0.07554
Epicentral distance of station farthest from the epicenter (degree) 0.35253
Number of stations at which the event was observed 7
Number of stations from which data was used for origin computation 7
Magnitude information

ML:0.8

Field Value
Value 0.8
Uncertainty 0.3
Num. used stations 12
Type of magnitude ML
Reference to an origin 93232331
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-07-26 10:13:00
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.FDMO.HHZ. 2021-07-26T09:44:07.57 0.3 undecidable manual S 4 0.2698 50 -0.04 74
IV.RM33.EHZ. 2021-07-26T09:44:07.92 0.3 undecidable manual S 157 0.2815 50 -0.03 74
IV.MML1.EHZ. 2021-07-26T09:44:04.24 0.3 undecidable manual P 349 0.3525 50 -0.36 68
IV.LNSS.HHZ. 2021-07-26T09:44:04.24 0.3 undecidable manual S 186 0.1655 50 -0.28 71
IV.MC2.EHZ. 2021-07-26T09:44:04.72 0.3 undecidable manual S 33 0.1709 50 0.03 75
IV.FDMO.HHZ. 2021-07-26T09:44:03.27 0.6 undecidable manual P 4 0.2698 50 0.09 48
IV.RM33.EHZ. 2021-07-26T09:44:03.34 1.0 undecidable manual P 157 0.2815 50 -0.04 24
IV.GAVE.EHZ. 2021-07-26T09:44:03.81 0.3 undecidable manual S 239 0.1448 124 -0.07 74
IV.NRCA.HHZ. 2021-07-26T09:44:01.66 0.3 undecidable manual S 29 0.0755 142 -0.25 73
IV.MC2.EHZ. 2021-07-26T09:44:01.66 0.1 undecidable manual P 33 0.1709 50 0.17 97
IV.GAVE.EHZ. 2021-07-26T09:44:01.32 0.1 undecidable manual P 239 0.1448 124 0.29 96
IV.LNSS.HHZ. 2021-07-26T09:44:01.60 0.3 undecidable manual P 186 0.1655 50 0.2 73
IV.NRCA.HHZ. 2021-07-26T09:44:00.04 0.1 positive manual P 29 0.0755 142 0.15 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHE. ML:1.1 0.00018166645 0.0768 AML other m 2021-07-26T09:44:01.82
IV.NRCA.HHN. ML:0.8 9.005036E-5 0.064 AML other m 2021-07-26T09:44:01.72
IV.GAVE.EHE. ML:0.9 7.02742545E-5 0.1792 AML other m 2021-07-26T09:44:04.36
IV.GAVE.EHN. ML:0.8 6.063358E-5 0.224 AML other m 2021-07-26T09:44:04.66
IV.NRCA.HNE. ML:1.1 0.00016969195 0.1536 AML other m 2021-07-26T09:44:01.75
IV.NRCA.HNN. ML:0.8 8.871513E-5 0.0704 AML other m 2021-07-26T09:44:01.72
IV.LNSS.HHE. ML:0.8 5.256118E-5 0.0768 AML other m 2021-07-26T09:44:04.83
IV.LNSS.HHN. ML:1 7.550245E-5 0.2624 AML other m 2021-07-26T09:44:05.12
IV.RM33.EHE. ML:0.3 1.2261199E-5 0.1408 AML other m 2021-07-26T09:44:08.88
IV.RM33.EHN. ML:0.3 1.12720085E-5 0.0832 AML other m 2021-07-26T09:44:08.35
IV.MML1.EHE. ML:0.4 1.06781995E-5 0.16 AML other m 2021-07-26T09:44:11.48
IV.MML1.EHN. ML:0.4 7.62513E-6 0.0576 AML other m 2021-07-26T09:44:11.14
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