Earthquake 1 km SW San Cesareo (RM), Magnitude Md 2.1, 23 May 1989 time 04:22:12 (Timezone UTC)

A magnitude Md 2.1 earthquake occured in region: 1 km SW San Cesareo (RM), on

23-05-1989 04:22:12 (UTC)
23-05-1989 06:22:12 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 41.8160, 12.7930 at 5 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
San Cesareo	RM	1	15153	15153
Rocca Priora	RM	3	11962	27115
Colonna	RM	4	4287	31402
Zagarolo	RM	4	17843	49245
Monte Compatri	RM	5	11978	61223
Monte Porzio Catone	RM	6	8693	69916
Gallicano nel Lazio	RM	7	6334	76250
Labico	RM	8	6379	82629
Palestrina	RM	9	21672	104301
Rocca di Papa	RM	9	17034	121335
Castel San Pietro Romano	RM	9	902	122237
Frascati	RM	9	22087	144324
Lariano	RM	10	13432	157756
Grottaferrata	RM	11	20327	178083
Valmontone	RM	11	15959	194042
Cave	RM	12	11287	205329
Poli	RM	12	2418	207747
Marino	RM	12	43026	250773
Nemi	RM	12	1943	252716
Casape	RM	13	744	253460
Rocca di Cave	RM	13	377	253837
Artena	RM	13	14276	268113
San Gregorio da Sassola	RM	13	1619	269732
Castel Gandolfo	RM	14	8997	278729
Capranica Prenestina	RM	14	351	279080
Velletri	RM	14	53303	332383
Albano Laziale	RM	15	41715	374098
Ariccia	RM	15	19407	393505
Genzano di Roma	RM	15	23970	417475
Genazzano	RM	15	6036	423511
Ciampino	RM	16	38412	461923
Tivoli	RM	17	56533	518456
Lanuvio	RM	17	13632	532088
Pisoniano	RM	17	770	532858
San Vito Romano	RM	18	3273	536131
Rocca Massima	LT	19	1136	537267
Castel Madama	RM	19	7399	544666

Municipalities with at least 50000 inhabitants

An earthquake occurred to

14 Km N of Velletri (53303 inhabitants)

17 Km S of Tivoli (56533 inhabitants)

21 Km S of Guidonia Montecelio (88673 inhabitants)

27 Km E of Roma (2864731 inhabitants)

27 Km NE of Aprilia (73446 inhabitants)

29 Km NE of Pomezia (62966 inhabitants)

40 Km N of Latina (125985 inhabitants)

43 Km NE of Anzio (54211 inhabitants)

46 Km E of Fiumicino (78395 inhabitants)

78 Km SW of L'Aquila (69753 inhabitants)

84 Km S of Terni (111501 inhabitants)

88 Km SE of Viterbo (67173 inhabitants)

88 Km E of Civitavecchia (52991 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	Md 2.1	1989-05-23 04:22:12	41.816	12.793	5	2013-07-15 08:41:04	Bollettino Sismico Italiano INGV	91909

Preferred location and magnitude until now.

Origin information

Origin

Field	Value
Time (UTC)	1989-05-23 04:22:12 ± 0.073
Latitude	41.8160 ± 0.0048
Longitude	12.7930 ± 0.0053
Depth (km)	5 (operator assigned)
Evaluation mode of Origin	manual
Evaluation status of Origin	reviewed
Version	1000 -> BULLETIN-VAX
Event type	earthquake
Origin ID	91909

Uncertainty

Field	Value
Preferred uncertainty description	horizontal uncertainty
Semi-major axis of confidence ellipse (meter)
Semi-minor axis of confidence ellipse (meter)
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi)
Circular confidence region, given by single value of horizontal uncertainty (meter)	685.5
Confidence level of the uncertainty (%)	68

Quality

Field	Value
Largest azimuthal gap in station distribution as seen from epicenter (degree)	127
Number of associated phases, regardless of their use for origin computation	8
Number of defining phases	8
RMS of the travel time residuals of the arrivals used for the origin computation (sec)	0.2
Epicentral distance of station closest to the epicenter (degree)	0.00057
Epicentral distance of station farthest from the epicenter (degree)	0.00688
Number of stations at which the event was observed	4
Number of stations from which data was used for origin computation	4

Magnitude information

Md:2.1

Field	Value
Value	2.1
Uncertainty
Num. used stations	3
Type of magnitude	Md
Reference to an origin	91909
Agency	INGV
Autore	Bollettino Sismico Italiano INGV
Time of creation (UTC)	2013-01-04 18:26:12

Picking and Arrival

SCNL	Time	Uncertainty	Polarity	Evaluation_mode	Phase	Azimuth	Distance(km)	Residual	Weight
--.SDI.Z.	1989-05-23T04:22:40.90	10.0	undecidable	manual	SG	97	0.7659	0.2	0.3
--.MNS.Z.	1989-05-23T04:22:33.76	10.0	undecidable	manual	SG	351	0.5661	-0.01	0.6
--.SDI.Z.	1989-05-23T04:22:28.35	10.0	undecidable	manual	PG	97	0.7659	0.06	1.2
--.MNS.Z.	1989-05-23T04:22:24.49	10.0	undecidable	manual	PG	351	0.5661	-0.27	0.7
--.RDP.Z.	1989-05-23T04:22:16.13	10.0	undecidable	manual	SG	224	0.0666	0.12	0.6
--.RMP.Z.	1989-05-23T04:22:15.65	10.0	undecidable	manual	SG	266	0.0666	0.07	0.7
--.RDP.Z.	1989-05-23T04:22:14.23	10.0	positive	manual	PG	224	0.0666	-0.27	1.7
--.RMP.Z.	1989-05-23T04:22:14.48	10.0	positive	manual	PG	266	0.0666	0.22	2.2

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 Md 2.1 on date 23-05-1989 and time 04:22:12 (UTC) in region 1 km SW San Cesareo (RM)

Municipalities within 20 km from the epicenter

Municipalities with at least 50000 inhabitants

Origin

Uncertainty

Quality

Md:2.1