Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.0 on date 09-04-2021 and time 18:18:17 (UTC) in region 7 km SE Castelsantangelo sul Nera (MC)

A magnitude ML 1.0 earthquake occured in region: 7 km SE Castelsantangelo sul Nera (MC), on

  • 09-04-2021 18:18:17 (UTC)
  • 09-04-2021 20:18:17 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.8460, 13.1970 at 12 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.

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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
Norcia PG 10 4957 5238
Montegallo AP 11 523 5761
Arquata del Tronto AP 12 1178 6939
Ussita MC 12 444 7383
Montemonaco AP 12 604 7987
Visso MC 13 1107 9094
Preci PG 13 724 9818
Montefortino FM 16 1178 10996
Bolognola MC 17 142 11138
Accumoli RI 17 667 11805
Acquasanta Terme AP 19 2916 14721
Amandola FM 20 3629 18350

Municipalities with at least 50000 inhabitants

An earthquake occurred to
42 Km E of Foligno (57155 inhabitants)
46 Km W of Teramo (54892 inhabitants)
55 Km NE of Terni (111501 inhabitants)
57 Km N of L'Aquila (69753 inhabitants)
72 Km E of Perugia (166134 inhabitants)
86 Km W of Montesilvano (53738 inhabitants)
90 Km SW of Ancona (100861 inhabitants)
93 Km W of Pescara (121014 inhabitants)
97 Km NW of Chieti (51815 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100 		ML 1.0 2021-04-09
18:18:17		 42.8457 13.1968 12 2021-04-09
18:23:06		 Sala Sismica INGV-Roma 88947631
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-04-09 18:18:17 ± 0.06
Latitude 42.8457 ± 0.0027
Longitude 13.1968 ± 0.0049
Depth (km) 12 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 88947631

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 389
Semi-minor axis of confidence ellipse (meter) 71
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 54
Circular confidence region, given by single value of horizontal uncertainty (meter) 390.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 66
Number of associated phases, regardless of their use for origin computation 18
Number of defining phases 18
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.16
Epicentral distance of station closest to the epicenter (degree) 0.06205
Epicentral distance of station farthest from the epicenter (degree) 0.37232
Number of stations at which the event was observed 9
Number of stations from which data was used for origin computation 9
Magnitude information

ML:1.0

Field Value
Value 1.0
Uncertainty 0.3
Num. used stations 17
Type of magnitude ML
Reference to an origin 88947631
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-04-09 18:23:06
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.TERO.HHZ. 2021-04-09T18:18:31.12 0.6 undecidable manual S 127 41.3253 92 -0.26 46
IV.RM33.EHZ. 2021-04-09T18:18:30.43 0.6 undecidable manual S 178 37.3293 92 0.12 48
IV.MF5.EHZ. 2021-04-09T18:18:28.16 0.6 undecidable manual S 53 26.5512 94 0.74 41
IV.CESI.HHZ. 2021-04-09T18:18:28.24 0.6 undecidable manual S 307 29.5482 94 0.01 49
IV.GAVE.EHZ. 2021-04-09T18:18:28.49 0.6 undecidable manual S 235 29.9478 93 0.16 48
IV.SMA1.EHZ. 2021-04-09T18:18:27.27 0.6 undecidable manual S 155 26.4513 94 -0.11 48
IV.CSP1.EHZ. 2021-04-09T18:18:27.48 0.6 undecidable manual S 1 27.3504 94 -0.15 48
IV.TERO.HHZ. 2021-04-09T18:18:25.53 0.6 undecidable manual P 127 41.3253 92 -0.13 47
IV.RM33.EHZ. 2021-04-09T18:18:24.97 1.0 undecidable manual P 178 37.3293 92 -0.08 24
IV.GAVE.EHZ. 2021-04-09T18:18:24.14 1.0 undecidable manual P 235 29.9478 93 0.23 24
IV.CSP1.EHZ. 2021-04-09T18:18:23.35 0.3 negative manual P 1 27.3504 94 -0.15 72
IV.MMO1.EHZ. 2021-04-09T18:18:23.57 0.6 undecidable manual S 61 12.0768 118 -0.1 50
IV.MF5.EHZ. 2021-04-09T18:18:23.69 1.0 negative manual P 53 26.5512 94 0.31 23
IV.CESI.HHZ. 2021-04-09T18:18:23.77 0.3 undecidable manual P 307 29.5482 94 -0.08 73
IV.SMA1.EHZ. 2021-04-09T18:18:23.19 0.6 undecidable manual P 155 26.4513 94 -0.17 48
IV.NRCA.HHZ. 2021-04-09T18:18:22.58 0.6 undecidable manual S 259 6.8931 141 -0.01 51
IV.MMO1.EHZ. 2021-04-09T18:18:21.17 0.3 undecidable manual P 61 12.0768 118 -0.05 76
IV.NRCA.HHZ. 2021-04-09T18:18:20.70 0.1 undecidable manual P 259 6.8931 141 0.11 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHE. ML:1.3 0.00027018975 0.1408 AML other m 2021-04-09T18:18:22.75
IV.NRCA.HHN. ML:1.1 0.00016345928500000002 0.0768 AML other m 2021-04-09T18:18:22.79
IV.NRCA.HNE. ML:1.3 0.000264357 0.1536 AML other m 2021-04-09T18:18:22.83
IV.NRCA.HNN. ML:1.1 0.000172589905 0.0896 AML other m 2021-04-09T18:18:22.80
IV.SMA1.EHE. ML:0.7 0.000023912105 0.0896 AML other m 2021-04-09T18:18:28.12
IV.SMA1.EHN. ML:0.6 0.000020393135 0.1024 AML other m 2021-04-09T18:18:27.77
IV.CSP1.EHE. ML:0.9 0.000039804530000000004 0.2816 AML other m 2021-04-09T18:18:28.00
IV.CSP1.EHN. ML:0.8 0.00003414115 0.256 AML other m 2021-04-09T18:18:29.74
IV.CESI.HHE. ML:0.9 0.000033501383000000004 0.0768 AML other m 2021-04-09T18:18:28.56
IV.CESI.HHN. ML:1.1 0.00005287832 0.0768 AML other m 2021-04-09T18:18:28.55
IV.GAVE.EHE. ML:0.9 0.000039919953 0.256 AML other m 2021-04-09T18:18:29.54
IV.GAVE.EHN. ML:0.8 0.000031557669999999996 0.2432 AML other m 2021-04-09T18:18:29.42
IV.RM33.HNN. ML:1.6 0.00014000541055 0.8576 AML other m 2021-04-09T18:18:39.42
IV.RM33.EHE. ML:0.6 0.000017131095 0.3328 AML other m 2021-04-09T18:18:32.13
IV.RM33.EHN. ML:0.4 0.000009815107 0.5248 AML other m 2021-04-09T18:18:41.29
IV.TERO.HHE. ML:1.0 0.000028769595000000003 0.1152 AML other m 2021-04-09T18:18:32.45
IV.TERO.HHN. ML:1.1 0.00004549628 0.0768 AML other m 2021-04-09T18:18:31.55
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