Earthquake with magnitude of ML 0.7 on date 31-08-2021 and time 15:21:29 (Italy) in region 3 km E Castelsantangelo sul Nera (MC)

A magnitude ML 0.7 earthquake occured in region: 3 km E Castelsantangelo sul Nera (MC), on

  • 31-08-2021 13:21:29 (UTC)
  • 31-08-2021 15:21:29 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.9, 13.192 at 3 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 3 281 281
Ussita MC 7 444 725
Visso MC 9 1107 1832
Bolognola MC 11 142 1974
Montemonaco AP 11 604 2578
Preci PG 13 724 3302
Montegallo AP 13 523 3825
Montefortino FM 13 1178 5003
Norcia PG 14 4957 9960
Acquacanina MC 15 121 10081
Fiastra MC 16 559 10640
Amandola FM 16 3629 14269
Arquata del Tronto AP 17 1178 15447
Fiordimonte MC 17 202 15649
Sarnano MC 18 3264 18913
Monte Cavallo MC 19 145 19058
Comunanza AP 19 3166 22224
Pieve Torina MC 20 1458 23682

Municipalities with at least 50000 inhabitants

An earthquake occurred to
40 Km E of Foligno (57155 inhabitants)
50 Km NW of Teramo (54892 inhabitants)
58 Km NE of Terni (111501 inhabitants)
63 Km N of L'Aquila (69753 inhabitants)
69 Km E of Perugia (166134 inhabitants)
84 Km SW of Ancona (100861 inhabitants)
89 Km W of Montesilvano (53738 inhabitants)
97 Km NW of Pescara (121014 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 0.7 2021-08-31
13:21:29
42.8997 13.1917 3 2021-08-31
13:28:21
Sala Sismica INGV-Roma 94870701
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-08-31 13:21:29 ± 0.16
Latitude 42.8997 ± 0.0054
Longitude 13.1917 ± 0.0074
Depth (km) 3 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 94870701

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 620
Semi-minor axis of confidence ellipse (meter) 72
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 316
Circular confidence region, given by single value of horizontal uncertainty (meter) 620
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 131
Number of associated phases, regardless of their use for origin computation 17
Number of defining phases 14
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.29
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.2671
Number of stations at which the event was observed 10
Number of stations from which data was used for origin computation 7
Magnitude information

ML:0.7

Field Value
Value 0.7
Uncertainty 0.3
Num. used stations 8
Type of magnitude ML
Reference to an origin 94870701
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-08-31 13:28:21
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.FIR.HHZ. 2021-08-31T13:22:18.28 3.0 undecidable manual Sn -2.85 0
IV.RIBO.EHZ.01 2021-08-31T13:21:53.58 3.0 undecidable manual P 0.02 0
IV.ASSB.HHZ. 2021-08-31T13:21:44.90 3.0 undecidable manual S 0.19 0
IV.MML1.EHZ. 2021-08-31T13:21:39.90 0.6 undecidable manual S 323 0.2671 95 -0.28 45
IV.MF5.EHZ. 2021-08-31T13:21:39.00 0.3 undecidable manual S 66 0.2149 97 0.83 57
IV.CSP1.EHZ. 2021-08-31T13:21:37.50 0.3 undecidable manual S 3 0.1925 97 0.2 70
IV.FDMO.HHZ. 2021-08-31T13:21:36.10 0.6 undecidable manual S 331 0.1565 99 0.16 47
IV.MML1.EHZ. 2021-08-31T13:21:35.41 1.0 negative manual P 323 0.2671 95 -0.39 22
IV.MF5.EHZ. 2021-08-31T13:21:34.73 0.6 negative manual P 66 0.2149 97 0.09 48
IV.NRCA.HHZ. 2021-08-31T13:21:33.60 0.1 undecidable manual S 221 0.0872 106 0.28 94
IV.FDMO.HHZ. 2021-08-31T13:21:33.13 0.6 positive manual P 331 0.1565 99 -0.23 47
IV.MMO1.EHZ. 2021-08-31T13:21:33.30 0.3 undecidable manual S 90 0.0989 104 -0.46 67
IV.CSP1.EHZ. 2021-08-31T13:21:33.83 1.0 undecidable manual P 3 0.1925 97 -0.31 23
IV.MMO1.EHZ. 2021-08-31T13:21:31.67 0.6 undecidable manual P 90 0.0989 104 -0.43 45
IV.NRCA.HHZ. 2021-08-31T13:21:31.78 0.1 undecidable manual P 221 0.0872 106 -0.06 98
IV.MC2.EHZ. 2021-08-31T13:21:30.90 0.6 undecidable manual S 351 0.0117 154 0.01 50
IV.MC2.EHZ. 2021-08-31T13:21:30.41 0.1 negative manual P 351 0.0117 154 -0.03 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHN. ML:1.3 0.000383 0.12 AML other m 2021-08-31T13:21:33.85
IV.NRCA.HHE. ML:1.3 0.0004065 0.12 AML other m 2021-08-31T13:21:33.96
IV.FDMO.HHE. ML:0.4 2.64E-5 0.18 AML other m 2021-08-31T13:21:36.33
IV.FDMO.HHN. ML:0.6 3.285E-5 0.12 AML other m 2021-08-31T13:21:36.51
IV.MML1.EHN. ML:0.6 1.815E-5 0.92 AML other m 2021-08-31T13:21:40.75
IV.MML1.EHE. ML:0.5 1.5225E-5 0.4 AML other m 2021-08-31T13:21:41.95
IV.CSP1.EHE. ML:0.7 3.8868337E-5 0.1984 AML other m 2021-08-31T13:21:38.64
IV.CSP1.EHN. ML:0.7 4.1292635E-5 0.16 AML other m 2021-08-31T13:21:38.55
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