Earthquake 6 km SE Norcia (PG), Magnitude ML 1.9, 21 March 2021 time 16:37:35 (Timezone UTC)

A magnitude ML 1.9 earthquake occured in region: 6 km SE Norcia (PG), on

21-03-2021 16:37:35 (UTC)
21-03-2021 17:37:35 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.7490, 13.1300 at 9 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

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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Display location by

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).

Municipality	Region	Distance (km)	Inhabitants	Cumulative Inhabitants
Norcia	PG	6	4957	4957
Cascia	PG	10	3217	8174
Accumoli	RI	11	667	8841
Arquata del Tronto	AP	14	1178	10019
Cittareale	RI	15	482	10501
Preci	PG	16	724	11225
Castelsantangelo sul Nera	MC	16	281	11506
Poggiodomo	PG	16	117	11623
Monteleone di Spoleto	PG	18	599	12222
Amatrice	RI	19	2657	14879
Cerreto di Spoleto	PG	19	1075	15954
Montegallo	AP	20	523	16477

Municipalities with at least 50000 inhabitants

An earthquake occurred to

42 Km SE of Foligno (57155 inhabitants)

45 Km E of Terni (111501 inhabitants)

48 Km W of Teramo (54892 inhabitants)

49 Km NW of L'Aquila (69753 inhabitants)

72 Km SE of Perugia (166134 inhabitants)

87 Km W of Montesilvano (53738 inhabitants)

90 Km NE of Guidonia Montecelio (88673 inhabitants)

91 Km NE of Tivoli (56533 inhabitants)

92 Km E of Viterbo (67173 inhabitants)

94 Km W of Pescara (121014 inhabitants)

96 Km W of Chieti (51815 inhabitants)

Recent and historical seismicity

Not available maps for this sismic event.

Seismic hazard

Not available maps for this sismic event.

Shakemap

Not available maps for this sismic event.

Felt maps

Not available maps for this sismic event.

Locations history

Type	Magnitude	Date and Time (UTC)	Latitude	Longitude	Depth (km)	Published time (UTC)	Author	Location ID
Bulletin Rev1000	ML 1.9	2021-03-21 16:37:35	42.7487	13.1302	9	2021-07-12 16:55:05	Bollettino Sismico Italiano INGV	88768191
Reviewed Rev100	ML 1.9	2021-03-21 16:37:35	42.7442	13.1343	10	2021-03-21 16:45:02	Sala Sismica INGV-Roma	88350681

Preferred location and magnitude until now.

Origin information

Origin

Field	Value
Time (UTC)	2021-03-21 16:37:35 ± 0.05
Latitude	42.7487 ± 0.0027
Longitude	13.1302 ± 0.0037
Depth (km)	9 ± 0 (from location)
Evaluation mode of Origin	manual
Evaluation status of Origin	reviewed
Version	1000 -> BULLETIN-INGV
Event type	earthquake
Origin ID	88768191

Uncertainty

Field	Value
Preferred uncertainty description	uncertainty ellipse
Semi-major axis of confidence ellipse (meter)	279
Semi-minor axis of confidence ellipse (meter)	216
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi)	86
Circular confidence region, given by single value of horizontal uncertainty (meter)	280.0
Confidence level of the uncertainty (%)	68

Quality

Field	Value
Largest azimuthal gap in station distribution as seen from epicenter (degree)	59
Number of associated phases, regardless of their use for origin computation	49
Number of defining phases	49
RMS of the travel time residuals of the arrivals used for the origin computation (sec)	0.27
Epicentral distance of station closest to the epicenter (degree)	0.08544
Epicentral distance of station farthest from the epicenter (degree)	0.73295
Number of stations at which the event was observed	25
Number of stations from which data was used for origin computation	25

Magnitudes information

ML:1.9

Field	Value
Value	1.9
Uncertainty	0.2
Num. used stations	28
Type of magnitude	ML
Reference to an origin	88768191
Agency	INGV
Autore	Bollettino Sismico Italiano INGV
Time of creation (UTC)	2021-04-04 15:35:10

ML:1.9

Field	Value
Value	1.9
Uncertainty	0.2
Num. used stations	38
Type of magnitude	ML
Reference to an origin	88350681
Agency	INGV
Autore	Sala Sismica INGV-Roma
Time of creation (UTC)	2021-03-21 16:45:02

Picking and Arrival

SCNL	Time	Uncertainty	Polarity	Evaluation_mode	Phase	Azimuth	Distance(km)	Takeoff_angle	Residual	Weight
IV.T0110.HHZ.	2021-03-21T16:37:59.94	0.3	undecidable	manual	S	137	78.1662	50	0.75	56
IV.VCEL.EHZ.	2021-03-21T16:37:57.37	0.3	undecidable	manual	S	124	70.0743	50	0.34	65
IV.SNTG.HHZ.	2021-03-21T16:37:54.08	0.1	undecidable	manual	S	345	58.1973	50	0.21	91
IV.ASSB.HHZ.	2021-03-21T16:37:52.19	0.1	undecidable	manual	S	311	50.3163	50	0.44	88
IV.CESX.HHZ.	2021-03-21T16:37:51.18	0.1	undecidable	manual	S	251	46.9197	50	0.32	90
IV.SAP2.EHZ.	2021-03-21T16:37:50.98	0.3	undecidable	manual	S	29	44.3223	50	0.82	58
IV.SSFR.HHZ.	2021-03-21T16:37:49.60	0.1	undecidable	manual	P	340	81.3519	50	-0.06	90
IV.MF5.EHZ.	2021-03-21T16:37:49.04	0.3	undecidable	manual	S	45	37.7289	50	0.65	63
IV.GUMA.HHZ.	2021-03-21T16:37:49.02	0.3	undecidable	manual	S	25	38.628	50	0.39	68
IV.CSP1.EHZ.	2021-03-21T16:37:48.41	0.3	undecidable	manual	S	9	38.5281	50	-0.2	71
IV.TERO.HHZ.	2021-03-21T16:37:48.83	0.3	undecidable	manual	S	110	41.1255	50	-0.46	67
IV.VCEL.EHZ.	2021-03-21T16:37:48.05	0.3	undecidable	manual	P	124	70.0743	50	0.12	68
IV.T0110.HHZ.	2021-03-21T16:37:48.86	1.0	positive	manual	P	137	78.1662	50	-0.32	21
IV.CESI.HHZ.	2021-03-21T16:37:47.04	0.3	undecidable	manual	S	327	33.8439	50	-0.31	70
IV.ARRO.EHZ.	2021-03-21T16:37:47.57	0.1	undecidable	manual	S	238	35.1426	50	-0.14	96
IV.SNTG.HHZ.	2021-03-21T16:37:46.26	0.6	undecidable	manual	P	345	58.1973	50	0.16	46
IV.CAMP.HHZ.	2021-03-21T16:37:46.64	0.3	undecidable	manual	S	136	32.8449	50	-0.43	68
IV.RM33.EHZ.	2021-03-21T16:37:45.36	0.3	undecidable	manual	S	165	27.4503	109	-0.21	72
IT.MTCL.HGZ.	2021-03-21T16:37:45.70	0.1	undecidable	manual	S	339	29.2485	50	-0.42	91
IV.ASSB.HHZ.	2021-03-21T16:37:44.71	0.6	undecidable	manual	P	311	50.3163	50	-0.17	46
IV.SAP2.EHZ.	2021-03-21T16:37:44.09	0.6	negative	manual	P	29	44.3223	50	0.12	47
IV.FEMA.HNZ.	2021-03-21T16:37:44.21	0.1	undecidable	manual	S	345	24.5532	111	-0.41	92
IV.CESX.HHZ.	2021-03-21T16:37:44.48	0.6	undecidable	manual	P	251	46.9197	50	0.12	47
IV.MF5.EHZ.	2021-03-21T16:37:43.04	0.3	undecidable	manual	P	45	37.7289	50	0.1	72
IV.MTRA.EHZ.	2021-03-21T16:37:43.54	0.3	undecidable	manual	S	88	21.7671	113	-0.17	73
IV.GUMA.HHZ.	2021-03-21T16:37:43.08	0.6	positive	manual	P	25	38.628	50	0	49
IV.MC2.EHZ.	2021-03-21T16:37:43.00	0.1	undecidable	manual	S	15	18.6702	117	0.24	97
IV.GAVE.HNZ.	2021-03-21T16:37:43.28	0.6	undecidable	manual	S	252	20.2686	115	0.05	50
IV.SMA1.EHZ.	2021-03-21T16:37:43.59	0.3	undecidable	manual	S	128	21.2676	114	0.03	76
IV.MMO1.EHZ.	2021-03-21T16:37:43.91	0.3	undecidable	manual	S	44	23.1546	112	-0.26	72
IV.T1299.HNZ.	2021-03-21T16:37:42.79	0.1	undecidable	manual	S	136	17.7711	118	0.32	95
IV.CESI.HHZ.	2021-03-21T16:37:42.04	0.1	undecidable	manual	P	327	33.8439	50	-0.3	93
IV.ARRO.EHZ.	2021-03-21T16:37:42.25	0.3	positive	manual	P	238	35.1426	50	-0.3	70
IV.CSP1.EHZ.	2021-03-21T16:37:42.73	0.1	positive	manual	P	9	38.5281	50	-0.34	92
IV.TERO.HHZ.	2021-03-21T16:37:42.90	1.0	positive	manual	P	110	41.1255	50	-0.56	22
IV.LNSS.HNZ.	2021-03-21T16:37:42.85	0.3	undecidable	manual	S	204	17.7711	118	0.38	71
IV.CAMP.HHZ.	2021-03-21T16:37:41.78	0.3	negative	manual	P	136	32.8449	50	-0.4	68
IT.MTCL.HGZ.	2021-03-21T16:37:41.37	0.1	undecidable	manual	P	339	29.2485	50	-0.26	95
IV.SMA1.EHZ.	2021-03-21T16:37:40.08	0.1	positive	manual	P	128	21.2676	114	-0.08	100
IV.FEMA.HNZ.	2021-03-21T16:37:40.80	0.1	undecidable	manual	P	345	24.5532	111	0.03	100
IV.MMO1.EHZ.	2021-03-21T16:37:40.29	0.1	positive	manual	P	44	23.1546	112	-0.21	97
IV.MTRA.EHZ.	2021-03-21T16:37:40.01	0.1	positive	manual	P	88	21.7671	113	-0.23	97
IV.RM33.EHZ.	2021-03-21T16:37:40.96	0.1	positive	manual	P	165	27.4503	109	-0.35	93
IV.NRCA.HNZ.	2021-03-21T16:37:40.34	0.3	undecidable	manual	S	352	9.4794	135	0.2	74
IV.GAVE.HNZ.	2021-03-21T16:37:40.05	0.1	undecidable	manual	P	252	20.2686	115	0.09	100
IV.LNSS.HNZ.	2021-03-21T16:37:39.66	0.1	undecidable	manual	P	204	17.7711	118	0.14	99
IV.T1299.HNZ.	2021-03-21T16:37:39.66	0.1	undecidable	manual	P	136	17.7711	118	0.14	99
IV.MC2.EHZ.	2021-03-21T16:37:39.87	0.1	undecidable	manual	P	15	18.6702	117	0.18	98
IV.NRCA.HNZ.	2021-03-21T16:37:38.44	0.1	negative	manual	P	352	9.4794	135	0.26	98

Station Magnitude and Amplitude

SCNL	mag	Generic_amplitude	Period	Type	Category	Unit	Time_window_reference
IV.LNSS.HNN.	ML:2.1	0.0011240000000000002	1.64	AML	other	m	2021-03-21T16:37:43.09
IV.LNSS.HHN.	ML:2.1	0.0011665	1.64	AML	other	m	2021-03-21T16:37:43.09
IV.LNSS.HNE.	ML:2.1	0.001075	0.16	AML	other	m	2021-03-21T16:37:43.13
IV.LNSS.HHE.	ML:2.2	0.0012250000000000002	0.16	AML	other	m	2021-03-21T16:37:43.13
IV.GAVE.EHE.	ML:2.0	0.0007975	0.64	AML	other	m	2021-03-21T16:37:43.38
IV.MTRA.EHE.	ML:1.9	0.0006005	0.18	AML	other	m	2021-03-21T16:37:43.80
IV.MTRA.HNE.	ML:1.9	0.00062	0.18	AML	other	m	2021-03-21T16:37:43.71
IV.MTRA.HNN.	ML:1.9	0.0005245	0.16	AML	other	m	2021-03-21T16:37:43.88
IV.MTRA.EHN.	ML:1.9	0.0005110000000000001	0.16	AML	other	m	2021-03-21T16:37:43.96
IV.GAVE.EHN.	ML:2.1	0.0009805	0.32	AML	other	m	2021-03-21T16:37:43.81
IV.SMA1.EHN.	ML:1.9	0.0005780000000000001	0.32	AML	other	m	2021-03-21T16:37:44.55
IV.SMA1.EHE.	ML:1.8	0.00045400000000000003	1.2	AML	other	m	2021-03-21T16:37:44.35
IV.RM33.HNN.	ML:1.8	0.0003345	0.58	AML	other	m	2021-03-21T16:37:45.99
IV.RM33.EHN.	ML:1.8	0.00033499999999999996	1.84	AML	other	m	2021-03-21T16:37:45.99
IV.CESI.HHN.	ML:1.7	0.000222	0.3	AML	other	m	2021-03-21T16:37:47.28
IV.RM33.EHE.	ML:1.8	0.00033850000000000004	1.46	AML	other	m	2021-03-21T16:37:47.02
IV.RM33.HNE.	ML:1.9	0.00039749999999999996	1.48	AML	other	m	2021-03-21T16:37:47.02
IV.ARRO.EHN.	ML:1.5	0.000122	0.64	AML	other	m	2021-03-21T16:37:48.05
IV.CSP1.EHN.	ML:2.2	0.0005685	0.66	AML	other	m	2021-03-21T16:37:48.32
IV.TERO.HHN.	ML:0.0	0.0003835	0.22	AML	other	m	2021-03-21T16:37:48.86
IV.TERO.HHE.	ML:0.0	0.0001875	1.32	AML	other	m	2021-03-21T16:37:49.24
IV.CSP1.EHE.	ML:2.1	0.000468	0.42	AML	other	m	2021-03-21T16:37:49.89
IV.ARRO.EHE.	ML:1.6	0.0001795	0.22	AML	other	m	2021-03-21T16:37:50.04
IV.CESI.HHE.	ML:1.6	0.00015269145	0.9984	AML	other	m	2021-03-21T16:37:47.32
IV.CESX.HHN.	ML:1.6	0.00012535	0.86	AML	other	m	2021-03-21T16:37:53.46
IV.CESX.HHE.	ML:1.5	0.00008854999999999998	1.52	AML	other	m	2021-03-21T16:37:55.93
IV.SSFR.HHN.	ML:0.0	0.00007089999999999999	0.9	AML	other	m	2021-03-21T16:38:04.68
IV.SSFR.HHE.	ML:0.0	0.0000882	1.38	AML	other	m	2021-03-21T16:38:07.05
IV.CAMP.HHE.	ML:0.0	0.00011740000000000001	1.78	AML	other	m	2021-03-21T16:37:46.05
IV.CAMP.HHN.	ML:0.0	0.00011449999999999999	0.8	AML	other	m	2021-03-21T16:37:47.95

TDMT - Time Domain Moment Tensor

Not available TDMT solution for this seismic event.

Fault Plane solutions in the area

Not available maps for this sismic event.

Download

Type	Description	Link
QuakeML - small	Event, Origin, FocalMechanism	Download
QuakeML - full	Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude	Download

Earthquake with magnitude of ML 1.9 on date 21-03-2021 and time 16:37:35 (UTC) in region 6 km SE Norcia (PG)

Municipalities within 20 km from the epicenter

Municipalities with at least 50000 inhabitants

Origin

Uncertainty

Quality

ML:1.9

ML:1.9