Earthquake 6 km E Montegallo (AP), Magnitude ML 1.8, 23 January 2021 time 11:29:42 (Timezone Italy)

A magnitude ML 1.8 earthquake occured in region: 6 km E Montegallo (AP), on

23-01-2021 10:29:42 (UTC)
23-01-2021 11:29:42 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.83, 13.41 at 24 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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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
Montegallo	AP	6	523	523
Roccafluvione	AP	6	2010	2533
Acquasanta Terme	AP	7	2916	5449
Palmiano	AP	9	196	5645
Venarotta	AP	9	2066	7711
Montemonaco	AP	10	604	8315
Arquata del Tronto	AP	11	1178	9493
Valle Castellana	TE	13	977	10470
Montefortino	FM	14	1178	11648
Ascoli Piceno	AP	14	49407	61055
Comunanza	AP	14	3166	64221
Force	AP	16	1354	65575
Amandola	FM	17	3629	69204
Montefalcone Appennino	FM	18	424	69628
Folignano	AP	18	9241	78869
Rotella	AP	19	906	79775
Rocca Santa Maria	TE	19	537	80312
Smerillo	FM	19	365	80677

Municipalities with at least 50000 inhabitants

An earthquake occurred to

31 Km NW of Teramo (54892 inhabitants)

53 Km N of L'Aquila (69753 inhabitants)

59 Km E of Foligno (57155 inhabitants)

69 Km E of Terni (111501 inhabitants)

70 Km NW of Montesilvano (53738 inhabitants)

78 Km NW of Pescara (121014 inhabitants)

82 Km NW of Chieti (51815 inhabitants)

88 Km S of Ancona (100861 inhabitants)

88 Km E of Perugia (166134 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

The earthquake effects in MCS scale as obtained from the compiled 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 1.8	2021-01-23 10:29:42	42.83	13.41	24	2021-01-23 10:40:53	Sala Sismica INGV-Roma	86489531

Preferred location and magnitude until now.

Origin information

Origin

Field	Value
Time (UTC)	2021-01-23 10:29:42 ± 0.14
Latitude	42.83 ± 0.00
Longitude	13.41 ± 0.01
Depth (km)	24 ± 1 (from location)
Evaluation mode of Origin	manual
Evaluation status of Origin	reviewed
Version	100 -> SURVEY-INGV
Event type	earthquake
Origin ID	86489531

Uncertainty

Field	Value
Preferred uncertainty description	uncertainty ellipse
Semi-major axis of confidence ellipse (meter)	557
Semi-minor axis of confidence ellipse (meter)	550
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi)	269
Circular confidence region, given by single value of horizontal uncertainty (meter)	560
Confidence level of the uncertainty (%)	68

Quality

Field	Value
Largest azimuthal gap in station distribution as seen from epicenter (degree)	133
Number of associated phases, regardless of their use for origin computation	41
Number of defining phases	21
RMS of the travel time residuals of the arrivals used for the origin computation (sec)	0.22
Epicentral distance of station closest to the epicenter (degree)	0
Epicentral distance of station farthest from the epicenter (degree)	0.40739
Number of stations at which the event was observed	32
Number of stations from which data was used for origin computation	13

Magnitude information

ML:1.8

Field	Value
Value	1.8
Uncertainty	0.1
Num. used stations	12
Type of magnitude	ML
Reference to an origin	86489531
Agency	INGV
Autore	Sala Sismica INGV-Roma
Time of creation (UTC)	2021-01-23 10:40:53

Picking and Arrival

SCNL	Time	Uncertainty	Polarity	Evaluation_mode	Phase	Azimuth	Distance	Takeoff_angle	Residual	Weight
IV.ERC.EHZ.	2021-01-23T10:31:17.57	3.0	undecidable	manual	Sn				-5.96	0
IV.CELB.HHZ.	2021-01-23T10:31:04.98	3.0	undecidable	manual	Sg				15.82	0
IV.CET2.HHZ.	2021-01-23T10:30:47.62	3.0	undecidable	manual	Sn				-3.92	0
IV.TDS.HHZ.	2021-01-23T10:30:47.34	3.0	undecidable	manual	Sn				-4.58	0
IV.AGLI.HHZ.	2021-01-23T10:30:42.46	3.0	positive	manual	Pg				18.73	0
IV.CPGN.EHZ.	2021-01-23T10:30:40.24	3.0	undecidable	manual	Sg				12.3	0
GU.GRAM.HHZ.	2021-01-23T10:30:39.70	3.0	positive	manual	Pg				19.58	0
IV.TRIF.CHZ.	2021-01-23T10:30:39.68	3.0	undecidable	manual	Sn				-0.01	0
IV.SERS.HHZ.	2021-01-23T10:30:36.08	3.0	undecidable	manual	Pg				14.76	0
IV.BRSN.EHZ.	2021-01-23T10:30:36.00	3.0	undecidable	manual	Sn				-1.78	0
IV.PCN.EHZ.	2021-01-23T10:30:33.09	3.0	undecidable	manual	Pn				6.28	0
IV.GIZZ.HHZ.	2021-01-23T10:30:29.11	3.0	negative	manual	Pg				9.25	0
IV.TRIF.CHZ.	2021-01-23T10:30:20.96	3.0	undecidable	manual	Pg				15.18	0
IV.IST3.HNZ.	2021-01-23T10:30:17.28	3.0	undecidable	manual	Pn				-1.85	0
IV.RIBO.EHZ.01	2021-01-23T10:30:04.69	3.0	undecidable	manual	Pn				0.64	0
IV.T0110.HHZ.	2021-01-23T10:30:04.30	3.0	undecidable	manual	Sg				0.75	0
IT.OPI.HGZ.	2021-01-23T10:30:03.48	3.0	undecidable	manual	Sn				-2.48	0
IV.GIGS.HHE.	2021-01-23T10:29:58.00	0.6	undecidable	manual	S	162	0.3984	111	0.17	47
IV.MURB.HHZ.	2021-01-23T10:29:56.68	3.0	undecidable	manual	Pn				2.47	0
IV.CAMP.HHE.	2021-01-23T10:29:55.30	0.3	undecidable	manual	S	180	0.2968	119	0.19	71
IV.GUMA.HHE.	2021-01-23T10:29:54.07	0.3	undecidable	manual	S	347	0.2356	126	0.49	67
IV.T1299.HNE.	2021-01-23T10:29:53.78	0.3	undecidable	manual	S	205	0.2194	128	0.6	65
IV.SMA1.EHZ.	2021-01-23T10:29:52.97	0.3	undecidable	manual	S	195	0.2095	130	0.01	75
IV.MF5.EHZ.	2021-01-23T10:29:52.16	0.3	undecidable	manual	S	13	0.1592	138	0.27	72
IV.GIGS.HHE.	2021-01-23T10:29:51.21	0.3	undecidable	manual	P	162	0.3984	111	-0.33	67
IV.CESI.HHZ.	2021-01-23T10:29:51.72	0.6	undecidable	manual	P	295	0.4074	110	0.03	47
IV.MMO1.EHZ.	2021-01-23T10:29:50.40	0.3	undecidable	manual	S	318	0.0899	154	-0.34	72
IV.RM33.EHZ.	2021-01-23T10:29:50.75	3.0	undecidable	manual	P					0
IV.MTRA.HNZ.	2021-01-23T10:29:50.24	0.3	undecidable	manual	S	187	0.0764	158	-0.34	71
IV.FDMO.HHZ.	2021-01-23T10:29:50.09	0.3	undecidable	manual	P	311	0.3112	117	-0.09	73
IV.CSP1.EHZ.	2021-01-23T10:29:49.94	0.3	undecidable	manual	P	330	0.2986	119	-0.06	73
IV.CAMP.HHE.	2021-01-23T10:29:49.86	0.3	undecidable	manual	P	180	0.2968	119	-0.11	72
IV.GUMA.HHE.	2021-01-23T10:29:49.12	0.3	undecidable	manual	P	347	0.2356	126	0.04	74
IV.TERO.HHE.	2021-01-23T10:29:49.23	0.3	undecidable	manual	P	146	0.2536	124	-0.11	72
IV.T1299.HNE.	2021-01-23T10:29:48.98	0.1	undecidable	manual	P	205	0.2194	128	0.12	97
IV.MF5.EHZ.	2021-01-23T10:29:48.15	0.1	undecidable	manual	P	13	0.1592	138	0.04	100
IV.SMA1.EHZ.	2021-01-23T10:29:48.72	0.1	undecidable	manual	P	195	0.2095	130	-0.01	100
IV.NRCA.HHZ.	2021-01-23T10:29:48.79	0.1	undecidable	manual	P	270	0.2158	129	-0.03	99
IV.MMO1.EHZ.	2021-01-23T10:29:47.29	0.1	undecidable	manual	P	318	0.0899	154	-0.16	99
IV.MTRA.HNZ.	2021-01-23T10:29:47.20	0.1	undecidable	manual	P	187	0.0764	158	-0.16	99
IV.MIDA.HHZ.	2021-01-23T10:29:46.94	3.0	negative	manual	P				-0.24	0

Station Magnitude and Amplitude

SCNL	mag	Generic_amplitude	Period	Type	Category	Unit	Time_window_reference
IV.MTRA.HNN.	ML:1.9	0.000573	0.16	AML	other	m	2021-01-23T10:29:50.25
IV.MTRA.EHN.	ML:1.9	0.0005655	0.16	AML	other	m	2021-01-23T10:29:50.33
IV.MTRA.HNE.	ML:1.9	0.0005335	0.2	AML	other	m	2021-01-23T10:29:50.31
IV.MTRA.EHE.	ML:1.9	0.00051	0.2	AML	other	m	2021-01-23T10:29:50.31
IV.SMA1.EHN.	ML:1.8	0.00031	0.24	AML	other	m	2021-01-23T10:29:53.14
IV.SMA1.EHE.	ML:1.8	0.0002905	0.3	AML	other	m	2021-01-23T10:29:53.40
IV.NRCA.HHN.	ML:1.9	0.000345	0.34	AML	other	m	2021-01-23T10:29:53.42
IV.NRCA.HNN.	ML:1.9	0.0003635	0.68	AML	other	m	2021-01-23T10:29:53.93
IV.NRCA.HHE.	ML:1.8	0.000249	0.74	AML	other	m	2021-01-23T10:29:54.42
IV.NRCA.HNE.	ML:1.8	0.0002735	0.42	AML	other	m	2021-01-23T10:29:55.28
IV.CESI.HHN.	ML:1.6	0.00011125	0.42	AML	other	m	2021-01-23T10:29:59.60
IV.CESI.HHE.	ML:1.7	0.0001229	0.42	AML	other	m	2021-01-23T10:30:38.03

TDMT - Time Domain Moment Tensor

Not available TDMT solution for this seismic event.

Focal Mechanism 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 1.8 on date 23-01-2021 and time 11:29:42 (Italy) in region 6 km E Montegallo (AP)

Municipalities within 20 km from the epicenter

Municipalities with at least 50000 inhabitants

The earthquake effects in MCS scale as obtained from the compiled questionnaire

Origin

Uncertainty

Quality

ML:1.8