Earthquake with magnitude of ML 1.1 on date 25-10-2021 and time 23:48:40 (Italy) in region 7 km E Castelsantangelo sul Nera (MC)

A magnitude ML 1.1 earthquake occured in region: 7 km E Castelsantangelo sul Nera (MC), on

  • 25-10-2021 21:48:40 (UTC)
  • 25-10-2021 23:48:40 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.866, 13.234 at 8 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
Castelsantangelo sul Nera MC 7 281 281
Montegallo AP 9 523 804
Montemonaco AP 9 604 1408
Arquata del Tronto AP 12 1178 2586
Ussita MC 12 444 3030
Montefortino FM 12 1178 4208
Visso MC 14 1107 5315
Norcia PG 14 4957 10272
Bolognola MC 14 142 10414
Preci PG 16 724 11138
Amandola FM 16 3629 14767
Acquasanta Terme AP 18 2916 17683
Comunanza AP 18 3166 20849
Palmiano AP 19 196 21045
Accumoli RI 19 667 21712
Acquacanina MC 19 121 21833
Roccafluvione AP 20 2010 23843
Sarnano MC 20 3264 27107
Fiastra MC 20 559 27666

Municipalities with at least 50000 inhabitants

An earthquake occurred to
44 Km E of Foligno (57155 inhabitants)
45 Km NW of Teramo (54892 inhabitants)
59 Km N of L'Aquila (69753 inhabitants)
59 Km NE of Terni (111501 inhabitants)
74 Km E of Perugia (166134 inhabitants)
84 Km W of Montesilvano (53738 inhabitants)
87 Km S of Ancona (100861 inhabitants)
92 Km W of Pescara (121014 inhabitants)
95 Km NW of Chieti (51815 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 1.1 2021-10-25
21:48:40
42.8658 13.2342 8 2021-10-25
21:53:01
Sala Sismica INGV-Roma 96989141
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-25 21:48:40 ± 0.1
Latitude 42.8658 ± 0.0018
Longitude 13.2342 ± 0.0025
Depth (km) 8 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 96989141

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 225
Semi-minor axis of confidence ellipse (meter) 102
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 323
Circular confidence region, given by single value of horizontal uncertainty (meter) 220
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 186
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) 0.08
Epicentral distance of station closest to the epicenter (degree) 0.05666
Epicentral distance of station farthest from the epicenter (degree) 0.22663
Number of stations at which the event was observed 5
Number of stations from which data was used for origin computation 5
Magnitude information

ML:1.1

Field Value
Value 1.1
Uncertainty 0
Num. used stations 2
Type of magnitude ML
Reference to an origin 96989141
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-25 21:53:01
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.CSP1.EHZ. 2021-10-25T21:48:49.28 0.1 undecidable manual S 355 0.2266 107 0.03 97
IV.FDMO.HHZ. 2021-10-25T21:48:48.33 0.1 undecidable manual S 328 0.2014 108 0 98
IV.CSP1.EHZ. 2021-10-25T21:48:45.64 1.0 undecidable manual P 355 0.2266 107 0.24 23
IV.FDMO.HHZ. 2021-10-25T21:48:44.65 1.0 positive manual P 328 0.2014 108 -0.22 23
IV.MMO1.EHZ. 2021-10-25T21:48:44.04 0.1 undecidable manual S 64 0.0755 132 0 100
IV.NRCA.HHZ. 2021-10-25T21:48:44.66 0.1 undecidable manual S 250 0.0935 126 0.07 98
IV.MC2.EHZ. 2021-10-25T21:48:43.50 0.1 undecidable manual S 324 0.0567 140 -0.02 100
IV.MMO1.EHZ. 2021-10-25T21:48:42.43 0.6 positive manual P 64 0.0755 132 0.04 50
IV.NRCA.HHZ. 2021-10-25T21:48:42.66 0.1 positive manual P 250 0.0935 126 -0.05 99
IV.MC2.EHZ. 2021-10-25T21:48:41.99 0.6 positive manual P 324 0.0567 140 -0.1 49
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHN. ML:1.2 0.0001985 0.12 AML other m 2021-10-25T21:48:44.77
IV.NRCA.HHE. ML:1.1 0.0001975 0.12 AML other m 2021-10-25T21:48:45.38
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